Hello Aspirant

On your Android smartphone, there is a tonne of knowledge available on the Internet that is sufficient to increase your intelligence without costing a dime. The smartphone you are holding in your hand is a fantastic educational tool, and app developers are utilising that potential to create instructive ebooks, interactive exhibits, and even programmes for scientists to aid in the pursuit of knowledge.

You can check:

• Unacademy or Toppr for basic concepts.
• Even you can follow the YouTube channel CrashCourseChemistry and PhysicsWallah.

I personally prefer Physicswallah, as I am myself studying from him.