which book is better for cracking iit

Hello,

There are a lot of books available which can help you in preparing well for IIT JEE. Some of the most recommended books are given below :

Physics :

Concepts of Physics by H.C Verma

Practice book Physics for  JEE Main and Advanced by DC Pandey

Mathematics :

Problems Plus in IIT Mathematics by A Das Gupta

Maths X| and X|| by R D Sharma

Chemistry :

Problems in Physical Chemistry for JEE (Main and Advanced) by Narendra Awasthi

Organic Chemistry by O.P Tandon

Instead of studying from all the books it would be better if you pick a book and stick to it. You should also give equal importance to NCERT textbooks.