IITs take the admission through JEE Advance. For the exam preparation I would suggest you first NCERT books as it will help you to clear your basic concept. The other books you can prefer-

Physics:

Concept of Physics by H.C. Verma
Fundamentals of Physics by DC Pandey

Chemistry:

Numerical problems in Chemistry by P. Bahadur
 O.P. Tandon
 J.D. Lee.

Mathematics:
Mathematics by R.D. Sharma
Trigonometry by S.L. Loney
 Algebra by Hall & Knight

Good luck!