Maths
Biology
Chemistry
English Language
History
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
Genetic information & variation
Inheritance, variation and evolution
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Ecology
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1l the quest for political stability: germany, 1871-1991
Britain & the wider world: 1745 -1901
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
World war one
Britain: 1509 -1745
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Tyra-Angel
24/11/2025
Biology
Higher Biology 2.1 - Metabolic Pathways
200
•
24 Nov 2025
•
Tyra-Angel
@xt_ang_studyx
Metabolism is essentially all the chemical reactions happening inside your... Show more
Think of metabolic pathways as assembly lines in a factory - they're series of chemical reactions that start with raw materials (substrates) and end with finished products. Your body runs thousands of these pathways simultaneously, including respiration, protein synthesis, and photosynthesis in plants.
Each step in a pathway needs a specific enzyme to make it happen. The product from one reaction becomes the starting material for the next, creating a chain reaction. These pathways are incredibly organised - they're integrated, controlled, and many are interconnected like a complex network.
Some pathways are reversible (can go both ways) whilst others are irreversible . Many also have alternative routes, like having multiple paths to the same destination. When pathways go wrong due to genetic mutations, you get conditions like phenylketonuria (PKU), where the body can't break down certain amino acids properly.
There are two main types of metabolic pathways: anabolic reactions build large molecules from small ones (requiring energy), whilst catabolic reactions break large molecules down into smaller ones (releasing energy). Think building up vs breaking down.
Key Point: Understanding that metabolic pathways are like organised assembly lines helps explain how your body coordinates thousands of chemical reactions efficiently.
Many toxins, poisons, and venoms work by interfering with metabolic pathways. Poisons damage body function, toxins are poisonous substances made by living organisms, and venoms are toxic fluids from creatures like snakes that contain multiple harmful substances.
A perfect example is catechol oxidase - the enzyme that makes damaged fruit turn brown. When fruit is bruised, this enzyme converts catechol into compounds that react with oxygen, creating that familiar brown colour. It's a simple metabolic pathway you can observe in your kitchen.
The cell membrane acts like a selective bouncer, controlling what enters and leaves cells. It's made of a phospholipid bilayer with various proteins scattered throughout, forming what scientists call the fluid mosaic model. The membrane stays flexible because lipid heads attract water whilst tails repel it.
Enzymes are absolutely essential for controlling metabolic pathways. They speed up reactions, remain unchanged after use, and crucially reduce the activation energy needed for reactions to occur. Without enzymes, the chemical reactions in your cells would be far too slow to sustain life.
Key Point: Cell membranes aren't just barriers - they're sophisticated control systems that work with enzymes to regulate metabolism.
Activation energy is like the initial push needed to start a reaction - enzymes dramatically reduce this energy requirement. They're essential because they speed up reactions, can be reused indefinitely, and make reactions possible at body temperature by helping substrates bind more easily.
Metabolic pathway control happens at multiple levels. If the right enzyme isn't present, the pathway stops completely. Cells control enzyme production through gene expression - they only make enzymes when the substrate is available, which saves energy.
Some pathways like glycolysis run continuously, so these enzymes are always produced. Others are made on demand. Inhibitors can stop enzymes from working, which is useful when you already have enough of an end product.
There are three types of enzyme inhibition: competitive inhibition (inhibitor blocks the active site), non-competitive inhibition (inhibitor changes the enzyme's shape), and feedback inhibition (end product stops an earlier enzyme in the pathway). Competitive inhibition can be reversed by adding more substrate, but non-competitive inhibition cannot.
Key Point: Feedback inhibition is like a thermostat - when there's enough product, the pathway automatically shuts down to prevent waste.
The cell membrane is selectively permeable, meaning it picks and chooses what passes through. Protein pores create channels for larger molecules, whilst carrier proteins actively transport specific substances against concentration gradients using energy.
The sodium/potassium pump is a crucial example - it maintains different ion concentrations inside and outside cells, which is essential for proper cell function. This active transport requires energy, so anything affecting respiration will impact transport too.
Enzyme specificity comes from the active site - the precise area where substrates bind. The substrate must be complementary in shape and show chemical attraction (affinity) to the active site. This is why each enzyme typically works with only one specific substrate.
The induced fit model explains how enzymes work: when a substrate enters the active site, both change shape slightly to fit perfectly together. This brings reactants into the right position, weakens chemical bonds (lowering activation energy), and helps the reaction occur more easily.
Key Point: Enzyme specificity is like a lock and key system, but both the lock and key can adjust their shapes for a perfect fit.
Enzyme activity depends heavily on conditions. At low substrate concentrations, reaction rates are slow because many active sites remain empty. As concentration increases, more active sites become occupied and reaction rates rise. Eventually, all active sites are full and enzyme concentration becomes the limiting factor.
Metabolic pathway direction is flexible - most enzymes can work both ways depending on what's available. If metabolite A is abundant, the pathway moves forward (A→B→C→D). If product C builds up and B decreases, enzyme 2 can reverse direction to maintain balance.
Gene expression controls which enzymes are made. If a substrate isn't present, cells don't waste energy making that enzyme. However, some enzymes like those in glycolysis are always needed, so their genes stay permanently switched on.
Signal molecules can trigger enzyme activation - these can come from inside the cell (intra-cellular) or from the environment (extra-cellular). Competitive inhibitors look similar to the real substrate and block the active site, but this can be overcome by adding more substrate.
Key Point: Cells are incredibly efficient - they only make enzymes when needed and can reverse pathways to maintain balance.
Non-competitive inhibitors work differently from competitive ones - they bind somewhere else on the enzyme and change its overall shape, which distorts the active site. Unlike competitive inhibition, you can't reverse this by adding more substrate because the active site itself is damaged.
End-product inhibition is a brilliant example of biological efficiency. When there's enough final product, it travels back and switches off an earlier enzyme in the pathway. This negative feedback control prevents cells from wasting resources making things they don't need.
This type of regulation is everywhere in biology - from controlling blood sugar levels to managing protein synthesis. It's like having automatic shut-off valves throughout your metabolic network, ensuring nothing gets overproduced.
Understanding these control mechanisms helps explain how cells maintain homeostasis and respond to changing conditions. When these systems fail, you get metabolic diseases, making this knowledge crucial for understanding health and disease.
Key Point: End-product inhibition shows how sophisticated cellular control systems are - they automatically prevent waste and maintain balance without conscious effort.
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
Tyra-Angel
@xt_ang_studyx
Metabolism is essentially all the chemical reactions happening inside your cells right now - from breaking down your breakfast to building new proteins. Understanding how these reactions are organised into pathways and controlled by enzymes is crucial for biology, as... Show more
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Think of metabolic pathways as assembly lines in a factory - they're series of chemical reactions that start with raw materials (substrates) and end with finished products. Your body runs thousands of these pathways simultaneously, including respiration, protein synthesis, and photosynthesis in plants.
Each step in a pathway needs a specific enzyme to make it happen. The product from one reaction becomes the starting material for the next, creating a chain reaction. These pathways are incredibly organised - they're integrated, controlled, and many are interconnected like a complex network.
Some pathways are reversible (can go both ways) whilst others are irreversible . Many also have alternative routes, like having multiple paths to the same destination. When pathways go wrong due to genetic mutations, you get conditions like phenylketonuria (PKU), where the body can't break down certain amino acids properly.
There are two main types of metabolic pathways: anabolic reactions build large molecules from small ones (requiring energy), whilst catabolic reactions break large molecules down into smaller ones (releasing energy). Think building up vs breaking down.
Key Point: Understanding that metabolic pathways are like organised assembly lines helps explain how your body coordinates thousands of chemical reactions efficiently.
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Many toxins, poisons, and venoms work by interfering with metabolic pathways. Poisons damage body function, toxins are poisonous substances made by living organisms, and venoms are toxic fluids from creatures like snakes that contain multiple harmful substances.
A perfect example is catechol oxidase - the enzyme that makes damaged fruit turn brown. When fruit is bruised, this enzyme converts catechol into compounds that react with oxygen, creating that familiar brown colour. It's a simple metabolic pathway you can observe in your kitchen.
The cell membrane acts like a selective bouncer, controlling what enters and leaves cells. It's made of a phospholipid bilayer with various proteins scattered throughout, forming what scientists call the fluid mosaic model. The membrane stays flexible because lipid heads attract water whilst tails repel it.
Enzymes are absolutely essential for controlling metabolic pathways. They speed up reactions, remain unchanged after use, and crucially reduce the activation energy needed for reactions to occur. Without enzymes, the chemical reactions in your cells would be far too slow to sustain life.
Key Point: Cell membranes aren't just barriers - they're sophisticated control systems that work with enzymes to regulate metabolism.
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Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Activation energy is like the initial push needed to start a reaction - enzymes dramatically reduce this energy requirement. They're essential because they speed up reactions, can be reused indefinitely, and make reactions possible at body temperature by helping substrates bind more easily.
Metabolic pathway control happens at multiple levels. If the right enzyme isn't present, the pathway stops completely. Cells control enzyme production through gene expression - they only make enzymes when the substrate is available, which saves energy.
Some pathways like glycolysis run continuously, so these enzymes are always produced. Others are made on demand. Inhibitors can stop enzymes from working, which is useful when you already have enough of an end product.
There are three types of enzyme inhibition: competitive inhibition (inhibitor blocks the active site), non-competitive inhibition (inhibitor changes the enzyme's shape), and feedback inhibition (end product stops an earlier enzyme in the pathway). Competitive inhibition can be reversed by adding more substrate, but non-competitive inhibition cannot.
Key Point: Feedback inhibition is like a thermostat - when there's enough product, the pathway automatically shuts down to prevent waste.
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Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
The cell membrane is selectively permeable, meaning it picks and chooses what passes through. Protein pores create channels for larger molecules, whilst carrier proteins actively transport specific substances against concentration gradients using energy.
The sodium/potassium pump is a crucial example - it maintains different ion concentrations inside and outside cells, which is essential for proper cell function. This active transport requires energy, so anything affecting respiration will impact transport too.
Enzyme specificity comes from the active site - the precise area where substrates bind. The substrate must be complementary in shape and show chemical attraction (affinity) to the active site. This is why each enzyme typically works with only one specific substrate.
The induced fit model explains how enzymes work: when a substrate enters the active site, both change shape slightly to fit perfectly together. This brings reactants into the right position, weakens chemical bonds (lowering activation energy), and helps the reaction occur more easily.
Key Point: Enzyme specificity is like a lock and key system, but both the lock and key can adjust their shapes for a perfect fit.
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Enzyme activity depends heavily on conditions. At low substrate concentrations, reaction rates are slow because many active sites remain empty. As concentration increases, more active sites become occupied and reaction rates rise. Eventually, all active sites are full and enzyme concentration becomes the limiting factor.
Metabolic pathway direction is flexible - most enzymes can work both ways depending on what's available. If metabolite A is abundant, the pathway moves forward (A→B→C→D). If product C builds up and B decreases, enzyme 2 can reverse direction to maintain balance.
Gene expression controls which enzymes are made. If a substrate isn't present, cells don't waste energy making that enzyme. However, some enzymes like those in glycolysis are always needed, so their genes stay permanently switched on.
Signal molecules can trigger enzyme activation - these can come from inside the cell (intra-cellular) or from the environment (extra-cellular). Competitive inhibitors look similar to the real substrate and block the active site, but this can be overcome by adding more substrate.
Key Point: Cells are incredibly efficient - they only make enzymes when needed and can reverse pathways to maintain balance.
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Join milions of students
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Non-competitive inhibitors work differently from competitive ones - they bind somewhere else on the enzyme and change its overall shape, which distorts the active site. Unlike competitive inhibition, you can't reverse this by adding more substrate because the active site itself is damaged.
End-product inhibition is a brilliant example of biological efficiency. When there's enough final product, it travels back and switches off an earlier enzyme in the pathway. This negative feedback control prevents cells from wasting resources making things they don't need.
This type of regulation is everywhere in biology - from controlling blood sugar levels to managing protein synthesis. It's like having automatic shut-off valves throughout your metabolic network, ensuring nothing gets overproduced.
Understanding these control mechanisms helps explain how cells maintain homeostasis and respond to changing conditions. When these systems fail, you get metabolic diseases, making this knowledge crucial for understanding health and disease.
Key Point: End-product inhibition shows how sophisticated cellular control systems are - they automatically prevent waste and maintain balance without conscious effort.
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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Explore the essential role of enzymes in biochemical reactions, including their structure, function, and mechanisms of action. This summary covers key concepts such as the active site, enzyme specificity, types of inhibitors, and factors affecting enzyme activity. Ideal for A-Level students seeking a comprehensive overview of enzymatic processes.
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BiologyExplore the role of enzymes as biological catalysts, including the enzyme-substrate complex, induced fit model, and types of inhibition (competitive and non-competitive). This summary covers key concepts such as enzyme concentration, reaction rates, and the impact of pH on enzyme activity, tailored for AQA specifications.
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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
