A free program for Android, by EduRev: Learning Mock Test Exam Preparation App.

This is an educational app for Class 9 students. 

This app provides you with the following learning modules:

CBSE Class 9 NCERT textbook & Solutions, Class 9 NCERT Solutions, with solutions for previous year papers MCQs, Online Test, Video Lectures, famous extra books (RD Sharma, Lakhmir Singh & Manjit Kaur), Sample Worksheets, CBSE Previous Year Papers with solutions, CBSE books & a lot more.

For the most part, the content is self-explanatory and covers all the essential topics that you will be tested on during your CBSE Class 9 exams.