There is no any particular book for the preparation. The topics will be covered from Physics, Chemistry, Mathematics. You can prefer NCERT books for the preparation, Go through with the previous year papers to know the level of the questions. Focus on your basic concepts. Do practise as much you can.

You can download the previous year papers with the given below link.

http://bhuonline.in/old-qus-paper-entr.html

Good Luck!