Hello aspirant,

Best Books for preparation of JEE exam are listed below.

Physics:

NCERT Physics Class XI & Class XII

Concepts of Physics by H.C. Verma

Chemistry:

NCERT Chemistry textbooks for Class XI and XII

ABC of Chemistry for Classes 11 and 12 by Modern

Organic Chemistry by OP Tandon

Physical Chemistry by OP Tandon

Mathematics:

Mathematics by Arihant Publications

Objective Mathematics by R.D Sharma

NCERT Mathematics Class XI and Class XII textbooks

To get more information go through below mentioned link.

https://engineering.careers360.com/articles/best-books-for-jee-main

You can check below mentioned link to get more information about JEE Knockout.

https://learn.careers360.com/knockout-jee-main-april/

May this information was helpful to you.

Best of Luck!!