Subjects
Maths
Chemistry
Biology
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
Genetics & ecosystems (a2 only)
Ecology
Cells
Show all topics
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
World war one
Britain: 1509 -1745
Show all topics
Physics
6 Dec 2025
149
11 pages
Hannah Crowley @annahrowley_sqarhqzr
Physics might seem daunting, but understanding forces, motion, and momentum is actually quite straightforward once you break it... Show more
You encounter vectors and scalars every day without realising it. When you tell someone you walked 5 metres, that's a scalar (just magnitude). But when you say you walked 5 metres north, that's a vector (magnitude plus direction).
Vectors include displacement, velocity, force, acceleration, and momentum - they all have both size and direction. Scalars only have size distance, speed, energy, time, and mass.
When forces combine, you get a resultant force. If a 3N force pushes right and a 1N force pushes left, the resultant is 2N to the right. For forces at angles, you can use scale diagrams - draw them to scale, measure the result, then convert back to Newtons.
💡 Quick tip Forces are balanced when the resultant equals zero - the object either stays still or moves at constant speed.
Free body diagrams show all forces acting on an object from the same centre point. Think of a car weight pulls down, normal contact pushes up, thrust pushes forward, and drag opposes motion.
Forces split into two categories contact forces (friction, drag, tension, normal contact, upthrust) require objects to touch, whilst non-contact forces (magnetism, gravity, electrostatic) work at a distance.
Falling objects demonstrate Newton's laws perfectly. If there's a resultant force, speed changes. No resultant force means constant speed - that's why skydivers eventually stop accelerating and fall at terminal velocity.
💡 Remember Unbalanced forces always cause acceleration, whether speeding up, slowing down, or changing direction.
Don't confuse mass with weight - mass measures matter (kg), whilst weight measures gravitational force (N). Weight equals mass times gravitational field strength W = mg. On Earth, g = 9.8 N/kg.
Work done transfers energy when forces move objects through distances Work done = Force × distance . This explains why pushing a car up a hill requires more energy than pushing it along flat ground.
Hooke's law governs springs and elastic materials. Force is directly proportional to extension F = ke, where k is the spring constant. This works until you exceed the elastic limit and permanently damage the material.
💡 Pro tip Springs store energy when stretched - that's why they ping back to their original length.
The Hooke's law experiment is straightforward measure the spring's original length, add masses in 100g increments, calculate extensions, then plot force against extension. The gradient equals the spring constant.
Speed calculations use the simple formula speed = distance ÷ time . Typical speeds include walking , running , cycling , and sound in air .
Understanding these measurements helps you tackle exam questions confidently. Whether calculating how long a journey takes or determining if a spring follows Hooke's law, the maths stays simple.
💡 Exam hint Always check your units match - metres per second, not kilometres per hour.
Distance-time graphs tell motion stories through their shapes. Straight lines show constant speed , horizontal lines mean stationary, and curves indicate acceleration or deceleration.
For curved lines, draw a tangent to find instantaneous speed - the steeper the gradient, the faster the motion. A graph climbing from 0 to 100m in 20 seconds shows 5 m/s constant speed.
Acceleration measures how quickly velocity changes acceleration = change in velocity ÷ time. It's measured in m/s² because you're dividing m/s by seconds.
💡 Graph trick The gradient of a distance-time graph always gives you speed.
Speed-time graphs pack loads of information. Gradients show acceleration , whilst the area under the line gives distance travelled. Horizontal lines mean constant speed, not stationary.
The equations of motion connect initial velocity (u), final velocity (v), acceleration (a), and displacement (s). The key equation v² - u² = 2as helps solve complex motion problems.
Newton's first law states that objects stay still or move at constant velocity unless a resultant force acts. This explains why you slide forward when cars brake suddenly - your body wants to keep moving.
💡 Memory aid Area under speed-time graphs = distance. Think of it as speed × time.
Newton's second law connects force, mass, and acceleration F = ma. Greater force means greater acceleration; greater mass means less acceleration for the same force.
Newton's third law states that interaction forces are equal and opposite. When you walk, you push back on the ground, and it pushes forward on you with equal force.
The Newton's second law experiment uses trolleys, masses, and light gates to prove F = ma. Keep total mass constant by moving masses from trolley to hanger - this isolates force as the changing variable.
💡 Real-world example Rockets work via Newton's third law - hot gases blast downward, pushing the rocket upward with equal force.
Terminal velocity occurs when drag equals weight during free fall. Initially, weight exceeds drag, causing downward acceleration. As speed increases, drag increases until forces balance.
When a parachute opens, drag suddenly exceeds weight, causing upward acceleration (deceleration downward). Speed decreases until forces rebalance at a slower terminal velocity.
This process repeats unbalanced forces cause acceleration, balanced forces mean constant velocity. The speed-time graph shows these phases clearly through acceleration, constant velocity, deceleration, then constant velocity again.
💡 Think about it Without air resistance, all objects would accelerate at 9.8 m/s² regardless of mass.
Momentum measures how hard it is to stop moving objects. Heavier, faster objects have more momentum and require greater forces to stop.
Conservation of momentum means total momentum before collision equals total momentum after - crucial for understanding car crashes and snooker shots.
Stopping distance combines thinking distance (travelled during reaction time) and braking distance (travelled whilst braking). Thinking distance increases proportionally with speed, but braking distance increases much faster.
💡 Safety fact Doubling speed roughly quadruples braking distance - that's why speed limits matter so much.
Pressure equals force divided by area . Small areas create large pressures (knives cut effectively), whilst large areas spread pressure (snowshoes prevent sinking).
In fluids, pressure increases with depth P = ρgh. This explains why submarines need thick hulls and why your ears pop when diving deep.
Moments measure turning effects moment = force × perpendicular distance. The principle of moments states that balanced objects have equal clockwise and anticlockwise moments.
💡 Practical tip Want to open a tight jar? Grip near the edge for maximum moment - less force needed.
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.
0
Smart Tools NEW
Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Mock Exam ✓ Essay Outlines
Quotes from every main character
English LiteratureApp Store
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
Hannah Crowley
@annahrowley_sqarhqzr
Physics might seem daunting, but understanding forces, motion, and momentum is actually quite straightforward once you break it down. These fundamental concepts explain everything from why you lean forward when a bus brakes suddenly to how skydivers reach terminal velocity.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
You encounter vectors and scalars every day without realising it. When you tell someone you walked 5 metres, that's a scalar (just magnitude). But when you say you walked 5 metres north, that's a vector (magnitude plus direction).
Vectors include displacement, velocity, force, acceleration, and momentum - they all have both size and direction. Scalars only have size: distance, speed, energy, time, and mass.
When forces combine, you get a resultant force. If a 3N force pushes right and a 1N force pushes left, the resultant is 2N to the right. For forces at angles, you can use scale diagrams - draw them to scale, measure the result, then convert back to Newtons.
💡 Quick tip: Forces are balanced when the resultant equals zero - the object either stays still or moves at constant speed.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Free body diagrams show all forces acting on an object from the same centre point. Think of a car: weight pulls down, normal contact pushes up, thrust pushes forward, and drag opposes motion.
Forces split into two categories: contact forces (friction, drag, tension, normal contact, upthrust) require objects to touch, whilst non-contact forces (magnetism, gravity, electrostatic) work at a distance.
Falling objects demonstrate Newton's laws perfectly. If there's a resultant force, speed changes. No resultant force means constant speed - that's why skydivers eventually stop accelerating and fall at terminal velocity.
💡 Remember: Unbalanced forces always cause acceleration, whether speeding up, slowing down, or changing direction.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Don't confuse mass with weight - mass measures matter (kg), whilst weight measures gravitational force (N). Weight equals mass times gravitational field strength: W = mg. On Earth, g = 9.8 N/kg.
Work done transfers energy when forces move objects through distances: Work done = Force × distance . This explains why pushing a car up a hill requires more energy than pushing it along flat ground.
Hooke's law governs springs and elastic materials. Force is directly proportional to extension: F = ke, where k is the spring constant. This works until you exceed the elastic limit and permanently damage the material.
💡 Pro tip: Springs store energy when stretched - that's why they ping back to their original length.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
The Hooke's law experiment is straightforward: measure the spring's original length, add masses in 100g increments, calculate extensions, then plot force against extension. The gradient equals the spring constant.
Speed calculations use the simple formula: speed = distance ÷ time . Typical speeds include walking , running , cycling , and sound in air .
Understanding these measurements helps you tackle exam questions confidently. Whether calculating how long a journey takes or determining if a spring follows Hooke's law, the maths stays simple.
💡 Exam hint: Always check your units match - metres per second, not kilometres per hour.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Distance-time graphs tell motion stories through their shapes. Straight lines show constant speed , horizontal lines mean stationary, and curves indicate acceleration or deceleration.
For curved lines, draw a tangent to find instantaneous speed - the steeper the gradient, the faster the motion. A graph climbing from 0 to 100m in 20 seconds shows 5 m/s constant speed.
Acceleration measures how quickly velocity changes: acceleration = change in velocity ÷ time. It's measured in m/s² because you're dividing m/s by seconds.
💡 Graph trick: The gradient of a distance-time graph always gives you speed.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Speed-time graphs pack loads of information. Gradients show acceleration , whilst the area under the line gives distance travelled. Horizontal lines mean constant speed, not stationary.
The equations of motion connect initial velocity (u), final velocity (v), acceleration (a), and displacement (s). The key equation v² - u² = 2as helps solve complex motion problems.
Newton's first law states that objects stay still or move at constant velocity unless a resultant force acts. This explains why you slide forward when cars brake suddenly - your body wants to keep moving.
💡 Memory aid: Area under speed-time graphs = distance. Think of it as speed × time.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Newton's second law connects force, mass, and acceleration: F = ma. Greater force means greater acceleration; greater mass means less acceleration for the same force.
Newton's third law states that interaction forces are equal and opposite. When you walk, you push back on the ground, and it pushes forward on you with equal force.
The Newton's second law experiment uses trolleys, masses, and light gates to prove F = ma. Keep total mass constant by moving masses from trolley to hanger - this isolates force as the changing variable.
💡 Real-world example: Rockets work via Newton's third law - hot gases blast downward, pushing the rocket upward with equal force.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Terminal velocity occurs when drag equals weight during free fall. Initially, weight exceeds drag, causing downward acceleration. As speed increases, drag increases until forces balance.
When a parachute opens, drag suddenly exceeds weight, causing upward acceleration (deceleration downward). Speed decreases until forces rebalance at a slower terminal velocity.
This process repeats: unbalanced forces cause acceleration, balanced forces mean constant velocity. The speed-time graph shows these phases clearly through acceleration, constant velocity, deceleration, then constant velocity again.
💡 Think about it: Without air resistance, all objects would accelerate at 9.8 m/s² regardless of mass.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Momentum measures how hard it is to stop moving objects. Heavier, faster objects have more momentum and require greater forces to stop.
Conservation of momentum means total momentum before collision equals total momentum after - crucial for understanding car crashes and snooker shots.
Stopping distance combines thinking distance (travelled during reaction time) and braking distance (travelled whilst braking). Thinking distance increases proportionally with speed, but braking distance increases much faster.
💡 Safety fact: Doubling speed roughly quadruples braking distance - that's why speed limits matter so much.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Pressure equals force divided by area . Small areas create large pressures (knives cut effectively), whilst large areas spread pressure (snowshoes prevent sinking).
In fluids, pressure increases with depth: P = ρgh. This explains why submarines need thick hulls and why your ears pop when diving deep.
Moments measure turning effects: moment = force × perpendicular distance. The principle of moments states that balanced objects have equal clockwise and anticlockwise moments.
💡 Practical tip: Want to open a tight jar? Grip near the edge for maximum moment - less force needed.
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.
0
Smart Tools NEW
Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Mock Exam ✓ Essay Outlines
Quotes from every main character
English LiteratureApp Store
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
Sociology