Hi aspirant, 

Here is the list of best books for iit preparation -

• Concepts of Physics by H. C. Verma,Understanding Physics by DC Pandey, Cengage Maths by G TIWANI, Comprehensive Mathematics for JEE Advanced by Tata McGraw Hill publications, NCERT Textbook, Problems in Physical Chemistry for JEE (Main & Advanced) by Narendra Awasthi, Organic Chemistry by Morrison and Boyd for Organic Chemistry

Hope this helps. Best of luck!!