best book for JEE

Books which you can consider -
Physics
Concepts of Physics Vol I and II by H.C. Verma
Problems in General Physics by I.E. Irodov
Fundamentals of Physics by Halliday, Resnick & Walker
Chemistry
Numerical Chemistry by P. Bahadur
Organic Chemistry by Paula Bruice Yurkanis
Inorganic Chemistry by J.D. Lee
Organic Chemistry by Morrison & Boyd
Mathematics
Maths XI & XII by NCERT
Trigonometry by S. L. Loney
Co-ordinate Geometry by S. L. Loney
Higher Algebra by Hall & Knight
Problems in Calculus of One Variable by I.A. Maron

Apart from this, you can follow below provided preparation tips -

1. Know the syllabus very well.
2. Read standard books only as there are many books available in the market so it is advisable to use the books which make all your concepts clear and which are easy to understand.
3. Understand the weightage of topics properly.
4. Proper Revision plan should be followed.
5. Mock Tests and Practice Tests should be done as this will help you to learn time management skills and this will also make you familiar with the exam pattern.

Hope this helps!!!