Dear Ambuj,

In order to prepare for BITSAT exam you can start your preparation by NCERT books.

After, completing your NCERT books you can recommended other books like Arihant, MTG and Disha publication.

You should also refer to previous year papers to know the exam pattern and to know the level of the exam.

Solve as many as mock test series as well for your practice to analyse your preparation level at regular interval of time.

If you are well prepared for JEE Main you can easily crack BITSAT exam.

All the best for your preparation and exam!!