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Responding to change (a2 only)
Infection and response
Homeostasis and response
Energy transfers (a2 only)
Cell biology
Organisms respond to changes in their internal and external environments (a-level only)
Biological molecules
Organisation
Substance exchange
Bioenergetics
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Inheritance, variation and evolution
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Britain & the wider world: 1745 -1901
1l the quest for political stability: germany, 1871-1991
The cold war
Inter-war germany
Medieval period: 1066 -1509
2d religious conflict and the church in england, c1529-c1570
2o democracy and nazism: germany, 1918-1945
1f industrialisation and the people: britain, c1783-1885
1c the tudors: england, 1485-1603
2m wars and welfare: britain in transition, 1906-1957
World war two & the holocaust
2n revolution and dictatorship: russia, 1917-1953
2s the making of modern britain, 1951-2007
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7 Dec 2025
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Reuben Cowell
@reubencowell
Economics is basically about how we deal with having unlimited... Show more











Ever wondered why you can't have everything you want? That's because wants are unlimited - you could always desire more things, whether it's the latest phone, designer trainers, or a holiday abroad. However, needs are limited to just what you require to survive, like food, water, and shelter.
This creates what economists call the economic problem - we have infinite wants but finite resources. This means tough choices have to be made about how we use our limited resources.
Every economic decision boils down to three key questions: What should be produced? How should it be produced? And who gets to benefit from what's produced? When you're deciding between buying a new game or saving for a concert ticket, you're facing these same fundamental economic choices.
Key Insight: The opportunity cost is whatever you give up when making a choice - if you buy the game, the concert ticket becomes your opportunity cost.

Think of the economy like a massive game with three main players, each with different goals and powers. Understanding how they interact helps explain why prices change and why certain products succeed or fail.
Consumers are individuals who buy goods and services - basically, that's you when you're shopping. You make decisions based on what you think is worth buying, weighing up benefits against price. However, because you're just one person, you don't have much power to influence markets on your own.
Producers supply goods and services to consumers. Their main motivation is usually profit - they want to make money by giving people what they want. They often have more market power than individual consumers.
Government acts as both referee and player. They make rules that affect both consumers and producers, spend money in the economy (like funding the NHS), and can influence economic activity through policies like taxation. They sometimes need to protect consumers from powerful producers who might exploit their position.
Remember: These three groups are constantly interacting, and their decisions affect each other - when one group changes their behaviour, it creates ripple effects throughout the economy.

Every good or service you use requires four essential ingredients, known as the factors of production. Think of them as the building blocks of everything in the economy.
Land isn't just soil - it includes all natural resources like farmland, minerals, water, and oil. Labour refers to all the workers in the economy, from shop assistants to brain surgeons. The quality of labour matters too - countries with better education and training systems tend to be more productive.
Capital means the tools, machinery, and infrastructure that help produce things. This includes everything from a baker's oven to the internet cables that let you stream videos. Enterprise is the willingness to take risks by organising the other factors - entrepreneurs are the people who spot opportunities and make things happen.
Each factor earns a reward: land earns rent, labour earns wages, capital earns interest, and enterprise earns profit. When demand for any factor increases, its reward typically goes up too.
Think About It: Your smartphone required all four factors - natural resources for materials, workers to assemble it, machinery to manufacture it, and entrepreneurs to design and market it.

Every day you make economic choices, often without realising it. Whether you're deciding how to spend your pocket money or which subjects to study, you're dealing with scarcity - the fact that you can't have everything you want.
Your disposable income - the money you actually have available to spend - forces you to prioritise. You might want new trainers, a gaming subscription, and money for nights out, but you probably can't afford all three.
When making choices, people try to maximise their utility - basically, getting the most satisfaction possible from their decisions. This explains why different people make different choices even in similar situations.
The concept of opportunity cost becomes crucial here. It's not just what you spend money on, but what you give up. If you choose to study for an extra hour instead of watching Netflix, your opportunity cost is the entertainment you missed.
Real-World Application: Understanding opportunity cost helps you make better decisions - always consider what you're giving up, not just what you're gaining.

Markets aren't just physical places like shopping centres - they're any situation where buyers and sellers come together to exchange goods and services. Online platforms, job websites, and even your local corner shop are all examples of markets.
The price mechanism is like an invisible hand that coordinates economic activity. When demand for something increases (like concert tickets for a popular band), prices rise. When demand falls (like for last season's fashion), prices drop to encourage sales.
Supply works similarly - if there's a shortage of something, prices go up. If there's too much stock, prices fall. This constant adjustment of prices based on supply and demand helps allocate scarce resources throughout the economy.
Markets essentially solve the economic problem by letting consumers signal what they want through their spending, and producers respond by supplying those goods and services. It's a system that works without anyone being in overall control.
Market Insight: Factor markets are where the factors of production are bought and sold, while product markets are where finished goods and services are traded.

The economy is divided into three interconnected sectors, each building on the others. Understanding these sectors helps explain how raw materials become the finished products you use every day.
The primary sector extracts natural resources directly from the environment. This includes farming, mining, fishing, and oil extraction. These businesses take materials straight from nature and either sell them directly or pass them to other sectors for processing.
The secondary sector takes primary sector outputs and manufactures them into finished goods. This includes everything from turning milk into cheese to refining oil into petrol. Construction also falls into this category, as it transforms raw materials into buildings and infrastructure.
The tertiary sector provides services rather than physical products. Banking, education, healthcare, entertainment, and tourism all belong here. In the UK, this sector now accounts for about 79% of economic activity, showing how our economy has shifted from manufacturing to services.
UK Focus: The UK has seen manufacturing decline since the 1990s due to competition from countries with lower costs, but we've maintained strength in high-value services and specialised manufacturing.

Specialisation means focusing on what you're best at rather than trying to do everything yourself. Just like you might be brilliant at maths but struggle with art, countries, firms, and individuals can benefit by concentrating on their strengths.
Division of labour breaks complex production processes into smaller, specialised tasks. Think about how your phone is made - different people design the software, manufacture the components, assemble the parts, and market the final product.
This approach brings major advantages: increased productivity, lower costs, better quality, and the development of specialist expertise. However, it can also create problems like worker boredom from repetitive tasks and reduced flexibility.
The magic happens through exchange - because everyone specialises, we need to trade with each other. You might be great at coding but terrible at growing food, so you exchange your programming skills for money to buy groceries from farmers.
Personal Application: Even in your studies, specialising in subjects you're passionate about and trading knowledge with classmates who excel in different areas can benefit everyone involved.



Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
Reuben Cowell
@reubencowell
Economics is basically about how we deal with having unlimited wants but limited resources to satisfy them. This creates the fundamental economic problem that affects everything from your personal spending decisions to how entire countries run their economies.

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Ever wondered why you can't have everything you want? That's because wants are unlimited - you could always desire more things, whether it's the latest phone, designer trainers, or a holiday abroad. However, needs are limited to just what you require to survive, like food, water, and shelter.
This creates what economists call the economic problem - we have infinite wants but finite resources. This means tough choices have to be made about how we use our limited resources.
Every economic decision boils down to three key questions: What should be produced? How should it be produced? And who gets to benefit from what's produced? When you're deciding between buying a new game or saving for a concert ticket, you're facing these same fundamental economic choices.
Key Insight: The opportunity cost is whatever you give up when making a choice - if you buy the game, the concert ticket becomes your opportunity cost.

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Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Think of the economy like a massive game with three main players, each with different goals and powers. Understanding how they interact helps explain why prices change and why certain products succeed or fail.
Consumers are individuals who buy goods and services - basically, that's you when you're shopping. You make decisions based on what you think is worth buying, weighing up benefits against price. However, because you're just one person, you don't have much power to influence markets on your own.
Producers supply goods and services to consumers. Their main motivation is usually profit - they want to make money by giving people what they want. They often have more market power than individual consumers.
Government acts as both referee and player. They make rules that affect both consumers and producers, spend money in the economy (like funding the NHS), and can influence economic activity through policies like taxation. They sometimes need to protect consumers from powerful producers who might exploit their position.
Remember: These three groups are constantly interacting, and their decisions affect each other - when one group changes their behaviour, it creates ripple effects throughout the economy.

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Improve your grades
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By signing up you accept Terms of Service and Privacy Policy
Every good or service you use requires four essential ingredients, known as the factors of production. Think of them as the building blocks of everything in the economy.
Land isn't just soil - it includes all natural resources like farmland, minerals, water, and oil. Labour refers to all the workers in the economy, from shop assistants to brain surgeons. The quality of labour matters too - countries with better education and training systems tend to be more productive.
Capital means the tools, machinery, and infrastructure that help produce things. This includes everything from a baker's oven to the internet cables that let you stream videos. Enterprise is the willingness to take risks by organising the other factors - entrepreneurs are the people who spot opportunities and make things happen.
Each factor earns a reward: land earns rent, labour earns wages, capital earns interest, and enterprise earns profit. When demand for any factor increases, its reward typically goes up too.
Think About It: Your smartphone required all four factors - natural resources for materials, workers to assemble it, machinery to manufacture it, and entrepreneurs to design and market it.

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By signing up you accept Terms of Service and Privacy Policy
Every day you make economic choices, often without realising it. Whether you're deciding how to spend your pocket money or which subjects to study, you're dealing with scarcity - the fact that you can't have everything you want.
Your disposable income - the money you actually have available to spend - forces you to prioritise. You might want new trainers, a gaming subscription, and money for nights out, but you probably can't afford all three.
When making choices, people try to maximise their utility - basically, getting the most satisfaction possible from their decisions. This explains why different people make different choices even in similar situations.
The concept of opportunity cost becomes crucial here. It's not just what you spend money on, but what you give up. If you choose to study for an extra hour instead of watching Netflix, your opportunity cost is the entertainment you missed.
Real-World Application: Understanding opportunity cost helps you make better decisions - always consider what you're giving up, not just what you're gaining.

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Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Markets aren't just physical places like shopping centres - they're any situation where buyers and sellers come together to exchange goods and services. Online platforms, job websites, and even your local corner shop are all examples of markets.
The price mechanism is like an invisible hand that coordinates economic activity. When demand for something increases (like concert tickets for a popular band), prices rise. When demand falls (like for last season's fashion), prices drop to encourage sales.
Supply works similarly - if there's a shortage of something, prices go up. If there's too much stock, prices fall. This constant adjustment of prices based on supply and demand helps allocate scarce resources throughout the economy.
Markets essentially solve the economic problem by letting consumers signal what they want through their spending, and producers respond by supplying those goods and services. It's a system that works without anyone being in overall control.
Market Insight: Factor markets are where the factors of production are bought and sold, while product markets are where finished goods and services are traded.

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The economy is divided into three interconnected sectors, each building on the others. Understanding these sectors helps explain how raw materials become the finished products you use every day.
The primary sector extracts natural resources directly from the environment. This includes farming, mining, fishing, and oil extraction. These businesses take materials straight from nature and either sell them directly or pass them to other sectors for processing.
The secondary sector takes primary sector outputs and manufactures them into finished goods. This includes everything from turning milk into cheese to refining oil into petrol. Construction also falls into this category, as it transforms raw materials into buildings and infrastructure.
The tertiary sector provides services rather than physical products. Banking, education, healthcare, entertainment, and tourism all belong here. In the UK, this sector now accounts for about 79% of economic activity, showing how our economy has shifted from manufacturing to services.
UK Focus: The UK has seen manufacturing decline since the 1990s due to competition from countries with lower costs, but we've maintained strength in high-value services and specialised manufacturing.

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Specialisation means focusing on what you're best at rather than trying to do everything yourself. Just like you might be brilliant at maths but struggle with art, countries, firms, and individuals can benefit by concentrating on their strengths.
Division of labour breaks complex production processes into smaller, specialised tasks. Think about how your phone is made - different people design the software, manufacture the components, assemble the parts, and market the final product.
This approach brings major advantages: increased productivity, lower costs, better quality, and the development of specialist expertise. However, it can also create problems like worker boredom from repetitive tasks and reduced flexibility.
The magic happens through exchange - because everyone specialises, we need to trade with each other. You might be great at coding but terrible at growing food, so you exchange your programming skills for money to buy groceries from farmers.
Personal Application: Even in your studies, specialising in subjects you're passionate about and trading knowledge with classmates who excel in different areas can benefit everyone involved.

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Improve your grades
Join milions of students
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Access to all documents
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Improve your grades
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Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user