A free program for Android, by Tarun Production.

Khan Sir GS Class Notes and Books is an educational app that provides you with the complete study material for your classes 9th and 10th in the subjects of biology and botany. It is also a useful resource for the students of chemistry, physics, and polity. You can read and study the notes on your smartphone or tablet. This app is designed to help the students prepare for their exams. It contains all the necessary study materials for the classes 9th and 10th. You can access the study materials in the following ways: