Hello,


So, i am assuming that you are asking about books that use can refer for preparation of BITSAT as well as mains.See, although there syllabus is almost similar but the exam pattern and type of questions are very different.On BITSAT you need speed and accuracy where as in JEE you need understanding and application.
But you can refer same books for both.

For Mathematics :
NCERT
RD Sharma
TMH
Amit M. Agarwal Arihant Publications (for different topics)

For Chemistry :
NCERT (compulsory)
RC Mukhergee
OP Tondon
Morrison and Boyd
P Bahadur

For Physics :
NCERT
HC Verma
DC Pandey
I.E Irodov
Problems and solution of physics by Shashi bhushan tiwari

Apart from that solve past year question papers.

God Luck

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