Khan Academy lets you learn almost everything for free.
+ You can learn everything + free: More than 10,000 videos, exercises and articles are now available on the Android app in math, science, computer science and much more.
+ Strengthen your knowledge: more than 40,000 interactive exercises adapted to the school curriculum are available with a correction and clues so that you never get stuck on an issue. Review what you learn at school or practice as you wish.
+ Quickly find what you need: navigation has been reviewed. It’s never been quicker to find what you’re looking for.
For More Info Google Play
Supported Android
{4.1 and UP}
Supported Android Version:-
Jelly Bean (4.1–4.3.1)- KitKat (4.4–4.4.4)- Lollipop (5.0–5.0.2) or UP
Download Khan Academy 2.5.5 APK For Android