Hello Girish,these are some tips to succeed in BITSAT exam :

1.Prepare the basic concepts from NCERT

2.Do concepts fundamentals from standard books.Especially in physics and maths.In chemistry NCERT foundation is best

3.Practice questions from question bank.

4.Revise the difficult qusetion on a monthly basis.

5.For heavy concepts reffered youtube educational video.

6.Atleast 4 hours on concept building and solving question from the book especially MCQ

7.Atleast 1 hours for question bank solving which make familiar with actual exam

For more prepartion tips regarding BITSAT follow this link:https://engineering.careers360.com/articles/how-prepare-for-bitsat

information regarding books:

List of Books for Chemistry 
1. Physical Chemistry by P. Bahadur
2. Organic Chemistry by Arihant (Theory & Practice)
3. Inorganic Chemistry by O. P. Tandon
List of Books for Physics 
1. Fundamentals of Physics- V. K. Mehta
2. Concept of Physics- H.C. Verma
3. Problems in General Physics- I.E. Irodov
4. NCERT Books of Class XI & XII
List of Maths Books 
1. Calculus- I.A. Maron
2. Integral Calculus- Amit Agarwal
3. Trignometry- S. L. Loney

Hope this helps you.