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9 Dec 2025
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Essential Chemistry Keywords for GCSE
Miriam
@mm_16
1 / 10
Atomic Structure and the Periodic Table Basics
Understanding atoms is like learning the alphabet of chemistry - once you've got it, everything else makes sense. An atom is simply the smallest part of an element that can exist, made up of a positively charged nucleus containing protons and neutrons, with negatively charged electrons whizzing around it.
The periodic table arranges elements by their atomic number (number of protons), putting similar elements in the same columns called groups. Alkali metals live in Group 1, halogens hang out in Group 7, and the noble gases chill in Group 0.
When atoms gain or lose electrons, they become ions with electric charges. Isotopes are atoms of the same element with different numbers of neutrons - they're like siblings with different personalities but the same family name.
💡 Quick Tip: Remember that the atomic number tells you both the number of protons AND electrons in a neutral atom!
Chemical Bonding and Structure
Think of chemical bonds as the friendships that hold atoms together in different ways. Ionic bonds form when metals give electrons to non-metals, creating oppositely charged ions that attract each other like magnets. Covalent bonds happen when atoms share electrons - it's like sharing earphones with your mate.
The three states of matter depend on how much energy particles have. In solids, particles are packed tightly in regular arrangements. Liquids let particles move past each other, whilst gases give particles complete freedom to zoom around randomly.
Diamond and graphite are both made of carbon but have completely different properties because of their structures. Diamond forms four bonds per carbon atom (making it super hard), whilst graphite forms three bonds creating layers that can slide (perfect for pencils).
💡 Remember: The stronger the forces between particles, the higher the melting and boiling points!
Quantitative Chemistry - The Maths Bit
Don't panic - this is just chemistry with numbers! The mole is chemistry's way of counting particles, like having a dozen eggs but for atoms. Avogadro's constant tells you exactly how many particles are in one mole (it's a massive number you don't need to memorise).
Conservation of mass means atoms can't just disappear during reactions - what goes in must come out. This helps you balance equations and work out how much product you'll get. The limiting reactant is like the ingredient you run out of first when cooking - it stops the reaction.
Percentage yield compares what you actually get versus what you should theoretically get. It's never 100% in real life because reactions aren't perfect, just like following a recipe doesn't always give you the exact result you expect.
💡 Pro Tip: Always check your units when doing calculations - mixing up grams and kilograms will mess up your answers!
Chemical Changes and Reactions
Acids and alkalis are chemical opposites that love to react with each other. Acids produce hydrogen ions and have pH values below 7, whilst alkalis produce hydroxide ions and have pH values above 7. When they meet, they neutralise each other to form water and a salt.
The pH scale runs from 0-14 and tells you how acidic or alkaline something is. Universal indicator changes colour across this range, making it perfect for testing substances. Strong acids like hydrochloric acid completely ionise, whilst weak acids like vinegar only partially ionise.
Oxidation involves gaining oxygen or losing electrons (think of rusting), whilst reduction is the opposite. Redox reactions have both happening at once. Electrolysis uses electricity to split up ionic compounds, with different products forming at each electrode.
💡 Memory Trick: OIL RIG - Oxidation Is Loss (of electrons), Reduction Is Gain (of electrons)!
Energy Changes in Reactions
Chemical reactions are like financial transactions - they either release energy (exothermic) or absorb energy (endothermic) from their surroundings. Exothermic reactions make things warmer (like hand warmers), whilst endothermic reactions make things cooler (like instant ice packs).
Activation energy is the minimum energy needed to get a reaction started - imagine pushing a boulder up a hill before it can roll down the other side. Reaction profiles show this energy journey graphically, helping you visualise what's happening.
Chemical cells and batteries convert chemical energy into electrical energy through reactions. Fuel cells are particularly clever because they use hydrogen and oxygen to generate electricity with water as the only waste product.
💡 Real-world Connection: Your phone battery works through reversible chemical reactions - that's why it can be recharged!
Reaction Rates and Equilibrium
Getting reactions to go faster is all about collision theory - particles need to bump into each other with enough energy to react. You can speed things up by increasing temperature (particles move faster), concentration (more particles in the same space), pressure (for gases), or surface area (more exposed particles).
Catalysts are like chemical matchmakers - they speed up reactions without being used up themselves by providing an alternative pathway with lower activation energy. They're incredibly useful in industry because they save time and energy.
Equilibrium occurs in reversible reactions when the forward and backward reactions happen at the same rate. Le Chatelier's Principle predicts how changing conditions affects equilibrium - the system always tries to oppose the change you make.
💡 Think of it like this: Equilibrium is like a busy restaurant - customers are constantly arriving and leaving, but the total number stays roughly the same!
Organic Chemistry Fundamentals
Organic chemistry is all about carbon compounds, and it's everywhere in your daily life. Alkanes are saturated hydrocarbons (like methane and propane) with single bonds, whilst alkenes have double bonds making them unsaturated and more reactive.
Crude oil is a treasure trove of hydrocarbons that we separate using fractional distillation. Cracking breaks long hydrocarbon chains into smaller, more useful molecules - it's like cutting a long rope into shorter, more manageable pieces.
Alcohols contain the -OH functional group (ethanol in alcoholic drinks), whilst carboxylic acids have -COOH (like ethanoic acid in vinegar). Polymers are giant molecules made by joining lots of small monomers together - think of them as chemical Lego chains.
💡 Everyday Connection: The plastic in your water bottle, the fuel in cars, and even your DNA are all examples of organic molecules!
Chemical Analysis Techniques
Chromatography is like a race for molecules - different substances travel at different speeds through the stationary phase, allowing you to separate and identify them. The Rf value tells you how far each substance travelled compared to the solvent.
Flame tests give metal ions distinctive colours when heated - sodium burns yellow-orange, copper burns green, and potassium burns lilac. Flame emission spectroscopy does this more precisely using instruments instead of just your eyes.
A pure substance in chemistry means just one compound with nothing else mixed in, whilst formulations are mixtures designed for specific purposes (like paint or medicine). Instrumental methods are faster and more accurate than traditional tests.
💡 CSI Connection: Forensic scientists use these same techniques to analyse evidence and solve crimes!
Atmospheric Chemistry
Our atmosphere has changed dramatically over Earth's history. Early photosynthesis by plants and algae produced the oxygen we breathe today whilst simultaneously removing carbon dioxide from the atmosphere.
Greenhouse gases like carbon dioxide, methane, and water vapour trap heat from the sun, keeping Earth warm enough for life. However, too much of these gases causes global climate change. Your carbon footprint measures all the greenhouse gases you're responsible for producing.
Burning fossil fuels releases pollutants that cause acid rain and health problems. Particulates from incomplete combustion cause global dimming by reducing the amount of sunlight reaching Earth's surface.
💡 Action Point: Understanding atmospheric chemistry helps you make informed decisions about environmental issues and climate change!
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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
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Best app on earth! no words because it’s too good
Thomas R
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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
Essential Chemistry Keywords for GCSE
Miriam
@mm_16
Chemistry can seem overwhelming with all its technical terms, but mastering key definitions is your secret weapon for GCSE success. This comprehensive guide breaks down essential chemistry vocabulary across all ten topics, from atomic structure to atmospheric chemistry, making complex... Show more
Atomic Structure and the Periodic Table Basics
Understanding atoms is like learning the alphabet of chemistry - once you've got it, everything else makes sense. An atom is simply the smallest part of an element that can exist, made up of a positively charged nucleus containing protons and neutrons, with negatively charged electrons whizzing around it.
The periodic table arranges elements by their atomic number (number of protons), putting similar elements in the same columns called groups. Alkali metals live in Group 1, halogens hang out in Group 7, and the noble gases chill in Group 0.
When atoms gain or lose electrons, they become ions with electric charges. Isotopes are atoms of the same element with different numbers of neutrons - they're like siblings with different personalities but the same family name.
💡 Quick Tip: Remember that the atomic number tells you both the number of protons AND electrons in a neutral atom!
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Chemical Bonding and Structure
Think of chemical bonds as the friendships that hold atoms together in different ways. Ionic bonds form when metals give electrons to non-metals, creating oppositely charged ions that attract each other like magnets. Covalent bonds happen when atoms share electrons - it's like sharing earphones with your mate.
The three states of matter depend on how much energy particles have. In solids, particles are packed tightly in regular arrangements. Liquids let particles move past each other, whilst gases give particles complete freedom to zoom around randomly.
Diamond and graphite are both made of carbon but have completely different properties because of their structures. Diamond forms four bonds per carbon atom (making it super hard), whilst graphite forms three bonds creating layers that can slide (perfect for pencils).
💡 Remember: The stronger the forces between particles, the higher the melting and boiling points!
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Quantitative Chemistry - The Maths Bit
Don't panic - this is just chemistry with numbers! The mole is chemistry's way of counting particles, like having a dozen eggs but for atoms. Avogadro's constant tells you exactly how many particles are in one mole (it's a massive number you don't need to memorise).
Conservation of mass means atoms can't just disappear during reactions - what goes in must come out. This helps you balance equations and work out how much product you'll get. The limiting reactant is like the ingredient you run out of first when cooking - it stops the reaction.
Percentage yield compares what you actually get versus what you should theoretically get. It's never 100% in real life because reactions aren't perfect, just like following a recipe doesn't always give you the exact result you expect.
💡 Pro Tip: Always check your units when doing calculations - mixing up grams and kilograms will mess up your answers!
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Chemical Changes and Reactions
Acids and alkalis are chemical opposites that love to react with each other. Acids produce hydrogen ions and have pH values below 7, whilst alkalis produce hydroxide ions and have pH values above 7. When they meet, they neutralise each other to form water and a salt.
The pH scale runs from 0-14 and tells you how acidic or alkaline something is. Universal indicator changes colour across this range, making it perfect for testing substances. Strong acids like hydrochloric acid completely ionise, whilst weak acids like vinegar only partially ionise.
Oxidation involves gaining oxygen or losing electrons (think of rusting), whilst reduction is the opposite. Redox reactions have both happening at once. Electrolysis uses electricity to split up ionic compounds, with different products forming at each electrode.
💡 Memory Trick: OIL RIG - Oxidation Is Loss (of electrons), Reduction Is Gain (of electrons)!
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Energy Changes in Reactions
Chemical reactions are like financial transactions - they either release energy (exothermic) or absorb energy (endothermic) from their surroundings. Exothermic reactions make things warmer (like hand warmers), whilst endothermic reactions make things cooler (like instant ice packs).
Activation energy is the minimum energy needed to get a reaction started - imagine pushing a boulder up a hill before it can roll down the other side. Reaction profiles show this energy journey graphically, helping you visualise what's happening.
Chemical cells and batteries convert chemical energy into electrical energy through reactions. Fuel cells are particularly clever because they use hydrogen and oxygen to generate electricity with water as the only waste product.
💡 Real-world Connection: Your phone battery works through reversible chemical reactions - that's why it can be recharged!
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Reaction Rates and Equilibrium
Getting reactions to go faster is all about collision theory - particles need to bump into each other with enough energy to react. You can speed things up by increasing temperature (particles move faster), concentration (more particles in the same space), pressure (for gases), or surface area (more exposed particles).
Catalysts are like chemical matchmakers - they speed up reactions without being used up themselves by providing an alternative pathway with lower activation energy. They're incredibly useful in industry because they save time and energy.
Equilibrium occurs in reversible reactions when the forward and backward reactions happen at the same rate. Le Chatelier's Principle predicts how changing conditions affects equilibrium - the system always tries to oppose the change you make.
💡 Think of it like this: Equilibrium is like a busy restaurant - customers are constantly arriving and leaving, but the total number stays roughly the same!
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Organic Chemistry Fundamentals
Organic chemistry is all about carbon compounds, and it's everywhere in your daily life. Alkanes are saturated hydrocarbons (like methane and propane) with single bonds, whilst alkenes have double bonds making them unsaturated and more reactive.
Crude oil is a treasure trove of hydrocarbons that we separate using fractional distillation. Cracking breaks long hydrocarbon chains into smaller, more useful molecules - it's like cutting a long rope into shorter, more manageable pieces.
Alcohols contain the -OH functional group (ethanol in alcoholic drinks), whilst carboxylic acids have -COOH (like ethanoic acid in vinegar). Polymers are giant molecules made by joining lots of small monomers together - think of them as chemical Lego chains.
💡 Everyday Connection: The plastic in your water bottle, the fuel in cars, and even your DNA are all examples of organic molecules!
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Chemical Analysis Techniques
Chromatography is like a race for molecules - different substances travel at different speeds through the stationary phase, allowing you to separate and identify them. The Rf value tells you how far each substance travelled compared to the solvent.
Flame tests give metal ions distinctive colours when heated - sodium burns yellow-orange, copper burns green, and potassium burns lilac. Flame emission spectroscopy does this more precisely using instruments instead of just your eyes.
A pure substance in chemistry means just one compound with nothing else mixed in, whilst formulations are mixtures designed for specific purposes (like paint or medicine). Instrumental methods are faster and more accurate than traditional tests.
💡 CSI Connection: Forensic scientists use these same techniques to analyse evidence and solve crimes!
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Atmospheric Chemistry
Our atmosphere has changed dramatically over Earth's history. Early photosynthesis by plants and algae produced the oxygen we breathe today whilst simultaneously removing carbon dioxide from the atmosphere.
Greenhouse gases like carbon dioxide, methane, and water vapour trap heat from the sun, keeping Earth warm enough for life. However, too much of these gases causes global climate change. Your carbon footprint measures all the greenhouse gases you're responsible for producing.
Burning fossil fuels releases pollutants that cause acid rain and health problems. Particulates from incomplete combustion cause global dimming by reducing the amount of sunlight reaching Earth's surface.
💡 Action Point: Understanding atmospheric chemistry helps you make informed decisions about environmental issues and climate change!
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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.
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English - inspector calls quotes and analysis
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English Literature10
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.9/5
App Store
4.8/5
Google Play
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