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8 Dec 2025
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GCSE Biology Paper 1 Triple Higher - Topic B9: Respiration
D
defne
@defneguvenn
1 / 10
What is Aerobic Respiration?
Think of aerobic respiration as your body's power station - it's how every cell creates the energy you need to stay alive. This process combines glucose (sugar) from food with oxygen from breathing to produce energy, carbon dioxide, and water.
The equation might look scary, but it's actually quite simple: glucose + oxygen → carbon dioxide + water + ATP energy. ATP (adenosine triphosphate) is like your body's rechargeable battery - it stores energy that your cells can use instantly.
Your blood carries oxygen to cells (oxygenated blood) and brings back waste carbon dioxide (deoxygenated blood). Every breath you take helps fuel this energy-making process.
Quick Tip: Remember that aerobic respiration is exothermic - it releases heat energy, which is why you warm up during exercise!
Mitochondria: Your Cellular Power Plants
Mitochondria are tiny structures inside your cells where aerobic respiration actually happens. Think of them as microscopic factories packed with special enzymes that break down glucose to release energy.
Muscle cells are absolutely crammed with mitochondria because they need loads of energy to contract and move your body. This is why men typically have a higher basal metabolic rate - they usually have more muscle mass, which means more mitochondria working around the clock.
Fat cells, on the other hand, just sit there storing energy, so they don't need nearly as many mitochondria. It's all about matching energy production to energy demand.
Remember: More muscle = more mitochondria = higher energy needs!
Why Your Body Needs Respiration
Your body has seven essential life processes (Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion, Nutrition), and respiration powers absolutely all of them. Without this energy transfer, your cells would shut down completely.
Respiration supplies energy for maintaining your body temperature at around 37°C - the perfect temperature for your enzymes to work at maximum speed. This is why mammals and birds are so good at staying active in different environments.
Plants use respiration energy for active transport, which moves water and mineral ions from soil into their roots against gravity. Even though plants make glucose through photosynthesis, they still need respiration to power their cellular processes.
Key Point: Respiration isn't just about breathing - it's about creating usable energy for every single thing your body does!
How Respiration Powers Your Life
Maintaining that crucial 37°C body temperature isn't just about comfort - it's about survival. Your enzymes work best at this temperature, allowing your body to carry out all its functions as quickly and efficiently as possible.
Movement requires massive amounts of energy as your muscles contract. This is why active muscle cells are packed with mitochondria - they're constantly producing ATP to fuel every single muscle contraction.
Even reproduction relies on respiration energy. Creating new life, whether it's producing gametes or supporting a developing baby, demands enormous amounts of cellular energy that only respiration can provide.
Think About It: Every heartbeat, every thought, every step you take is powered by the glucose and oxygen you consume!
Why Exercise Makes You Breathe Hard
When you exercise, your muscles work overtime and desperately need more energy to keep contracting. To make more energy, your body needs to break down more glucose, which requires loads more oxygen.
Your breathing rate increases and becomes deeper because your muscles are basically screaming for oxygen. It's like pressing the accelerator on energy production - everything has to speed up to meet demand.
Your heart rate rockets up too, pumping blood faster around your body to deliver that precious oxygen to working muscles. The harder you exercise, the faster everything works to keep up with energy demands.
Simple Logic: More exercise = more energy needed = more oxygen required = faster breathing and heart rate!
The Science Behind Exercise Response
When you exercise, your arteries supplying blood to muscles dilate (get wider), massively increasing the flow of oxygenated blood. This speeds up the delivery of both oxygen and glucose while also removing waste carbon dioxide more efficiently.
Your breathing doesn't just get faster - it gets deeper too. Each breath brings more air into your lungs, meaning more oxygen gets picked up by your red blood cells and transported to working muscles.
Glycogen stored in your muscles converts back to glucose, providing instant fuel for the increased cellular respiration your muscles desperately need. It's like having an emergency energy reserve that kicks in during exercise.
Pro Tip: Understanding these changes helps explain why regular exercise makes these responses more efficient over time!
Measuring Exercise Effects (Practical Skills)
You can easily measure how exercise affects your body using just a stopwatch and your pulse. Start by finding your resting heart rate - place your finger on the artery in your wrist or neck and count beats per minute.
Take your pulse while sitting, then standing, then after moderate exercise like walking on the spot for 3 minutes. Always take three readings and calculate the mean to get accurate results.
The key is measuring how long it takes for your heart rate to return to its resting level - this recovery time tells you loads about your fitness level.
Exam Tip: Practice finding your pulse quickly - you might need to demonstrate this practical technique!
Recording and Analysing Your Results
After vigorous exercise like running for 3 minutes, measure your heart rate immediately, then keep checking every minute until it returns to normal. This gives you brilliant data about your body's response to exercise.
Calculate the percentage increase in heart rate for both moderate and vigorous exercise - this shows how much harder your heart works under different conditions. Plot graphs showing pulse rate changes and recovery times to visualise the patterns.
These graphs will clearly show the relationship between exercise intensity and your body's physiological response, plus how quickly you recover.
Graph Skills: Clear, labelled graphs showing heart rate over time are perfect for demonstrating scientific communication skills!
Fit vs Unfit: The Key Differences
Fit people have hearts that pump out 80cm³ of blood per beat compared to just 64cm³ for unfit people. Their hearts are also larger (140cm³ vs 120cm³), meaning they can hold and pump more blood efficiently.
This efficiency means fit people have lower resting pulse rates (63 BPM vs 72 BPM) and slower breathing rates (12 vs 14 breaths per minute). Their bodies don't have to work as hard to deliver the same amount of oxygen and nutrients.
The data clearly shows that fitness training makes your cardiovascular system much more efficient at rest and during exercise.
Key Insight: Fitness isn't just about looking good - it's about making your entire body work more efficiently!
Understanding Fitness Differences
Unfit people need their hearts to beat faster to compensate for pumping less blood with each beat. It's like having a smaller engine that has to work harder to do the same job as a larger, more efficient engine.
Fit people's larger heart volume means more oxygen can be pumped around the body with each beat. Unfit people have to breathe faster to get the same amount of oxygen into their blood, making their breathing rate higher.
Essentially, an unfit heart has to work much harder to deliver the same volume of blood and oxygen that a fit person's heart delivers easily. This is why building fitness is so important for long-term health.
Bottom Line: Regular exercise trains your heart to be more efficient, making everyday activities feel easier and improving your overall health!
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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.
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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
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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
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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.
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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
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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
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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
GCSE Biology Paper 1 Triple Higher - Topic B9: Respiration
D
defne
@defneguvenn
Ever wondered why you get out of breath when running or why your heart pounds after exercise? Respirationis the amazing process that keeps your body powered up by converting glucose and oxygen into energy. Understanding how your body creates... Show more
What is Aerobic Respiration?
Think of aerobic respiration as your body's power station - it's how every cell creates the energy you need to stay alive. This process combines glucose (sugar) from food with oxygen from breathing to produce energy, carbon dioxide, and water.
The equation might look scary, but it's actually quite simple: glucose + oxygen → carbon dioxide + water + ATP energy. ATP (adenosine triphosphate) is like your body's rechargeable battery - it stores energy that your cells can use instantly.
Your blood carries oxygen to cells (oxygenated blood) and brings back waste carbon dioxide (deoxygenated blood). Every breath you take helps fuel this energy-making process.
Quick Tip: Remember that aerobic respiration is exothermic - it releases heat energy, which is why you warm up during exercise!
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Mitochondria: Your Cellular Power Plants
Mitochondria are tiny structures inside your cells where aerobic respiration actually happens. Think of them as microscopic factories packed with special enzymes that break down glucose to release energy.
Muscle cells are absolutely crammed with mitochondria because they need loads of energy to contract and move your body. This is why men typically have a higher basal metabolic rate - they usually have more muscle mass, which means more mitochondria working around the clock.
Fat cells, on the other hand, just sit there storing energy, so they don't need nearly as many mitochondria. It's all about matching energy production to energy demand.
Remember: More muscle = more mitochondria = higher energy needs!
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Why Your Body Needs Respiration
Your body has seven essential life processes (Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion, Nutrition), and respiration powers absolutely all of them. Without this energy transfer, your cells would shut down completely.
Respiration supplies energy for maintaining your body temperature at around 37°C - the perfect temperature for your enzymes to work at maximum speed. This is why mammals and birds are so good at staying active in different environments.
Plants use respiration energy for active transport, which moves water and mineral ions from soil into their roots against gravity. Even though plants make glucose through photosynthesis, they still need respiration to power their cellular processes.
Key Point: Respiration isn't just about breathing - it's about creating usable energy for every single thing your body does!
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Improve your grades
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By signing up you accept Terms of Service and Privacy Policy
How Respiration Powers Your Life
Maintaining that crucial 37°C body temperature isn't just about comfort - it's about survival. Your enzymes work best at this temperature, allowing your body to carry out all its functions as quickly and efficiently as possible.
Movement requires massive amounts of energy as your muscles contract. This is why active muscle cells are packed with mitochondria - they're constantly producing ATP to fuel every single muscle contraction.
Even reproduction relies on respiration energy. Creating new life, whether it's producing gametes or supporting a developing baby, demands enormous amounts of cellular energy that only respiration can provide.
Think About It: Every heartbeat, every thought, every step you take is powered by the glucose and oxygen you consume!
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Why Exercise Makes You Breathe Hard
When you exercise, your muscles work overtime and desperately need more energy to keep contracting. To make more energy, your body needs to break down more glucose, which requires loads more oxygen.
Your breathing rate increases and becomes deeper because your muscles are basically screaming for oxygen. It's like pressing the accelerator on energy production - everything has to speed up to meet demand.
Your heart rate rockets up too, pumping blood faster around your body to deliver that precious oxygen to working muscles. The harder you exercise, the faster everything works to keep up with energy demands.
Simple Logic: More exercise = more energy needed = more oxygen required = faster breathing and heart rate!
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The Science Behind Exercise Response
When you exercise, your arteries supplying blood to muscles dilate (get wider), massively increasing the flow of oxygenated blood. This speeds up the delivery of both oxygen and glucose while also removing waste carbon dioxide more efficiently.
Your breathing doesn't just get faster - it gets deeper too. Each breath brings more air into your lungs, meaning more oxygen gets picked up by your red blood cells and transported to working muscles.
Glycogen stored in your muscles converts back to glucose, providing instant fuel for the increased cellular respiration your muscles desperately need. It's like having an emergency energy reserve that kicks in during exercise.
Pro Tip: Understanding these changes helps explain why regular exercise makes these responses more efficient over time!
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Improve your grades
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By signing up you accept Terms of Service and Privacy Policy
Measuring Exercise Effects (Practical Skills)
You can easily measure how exercise affects your body using just a stopwatch and your pulse. Start by finding your resting heart rate - place your finger on the artery in your wrist or neck and count beats per minute.
Take your pulse while sitting, then standing, then after moderate exercise like walking on the spot for 3 minutes. Always take three readings and calculate the mean to get accurate results.
The key is measuring how long it takes for your heart rate to return to its resting level - this recovery time tells you loads about your fitness level.
Exam Tip: Practice finding your pulse quickly - you might need to demonstrate this practical technique!
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Recording and Analysing Your Results
After vigorous exercise like running for 3 minutes, measure your heart rate immediately, then keep checking every minute until it returns to normal. This gives you brilliant data about your body's response to exercise.
Calculate the percentage increase in heart rate for both moderate and vigorous exercise - this shows how much harder your heart works under different conditions. Plot graphs showing pulse rate changes and recovery times to visualise the patterns.
These graphs will clearly show the relationship between exercise intensity and your body's physiological response, plus how quickly you recover.
Graph Skills: Clear, labelled graphs showing heart rate over time are perfect for demonstrating scientific communication skills!
Sign up to see the contentIt's free!
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Fit vs Unfit: The Key Differences
Fit people have hearts that pump out 80cm³ of blood per beat compared to just 64cm³ for unfit people. Their hearts are also larger (140cm³ vs 120cm³), meaning they can hold and pump more blood efficiently.
This efficiency means fit people have lower resting pulse rates (63 BPM vs 72 BPM) and slower breathing rates (12 vs 14 breaths per minute). Their bodies don't have to work as hard to deliver the same amount of oxygen and nutrients.
The data clearly shows that fitness training makes your cardiovascular system much more efficient at rest and during exercise.
Key Insight: Fitness isn't just about looking good - it's about making your entire body work more efficiently!
Sign up to see the contentIt's free!
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Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Understanding Fitness Differences
Unfit people need their hearts to beat faster to compensate for pumping less blood with each beat. It's like having a smaller engine that has to work harder to do the same job as a larger, more efficient engine.
Fit people's larger heart volume means more oxygen can be pumped around the body with each beat. Unfit people have to breathe faster to get the same amount of oxygen into their blood, making their breathing rate higher.
Essentially, an unfit heart has to work much harder to deliver the same volume of blood and oxygen that a fit person's heart delivers easily. This is why building fitness is so important for long-term health.
Bottom Line: Regular exercise trains your heart to be more efficient, making everyday activities feel easier and improving your overall health!
We thought you’d never ask...
What is the Knowunity AI companion?
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.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
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