Hello,

The best books for JEE Mains is as follows:

A. Best books for Physics:

1. Concepts of Physics (Vol. 1&2) by H.C. Verma

2. Fundamentals of Physics by Halliday, resnick and walker

3. Understanding Physics by DC Pandey

4. Problems in General Physics by I.E. Irodov

5. Understanding Physics by Freedman

B. Best books for Chemistry:

1. NCERT (Class 11 and 12)

2. Modern approach to Chemical Calculations by RC Mukherjee

3. Organic Chemistry by OP Tandon

4. Concept of Physical Chemistry by P bahadur

5. Concise Inorganic Chemistry by JD Lee

C. Best books for Maths:

1. Objective Mathematics by RD Sharma.

2. Plane Trigonometry by SL Loney

3. The elements of Coordinate geometry by SL Loney.

4. Algebra by Dr SK Goyal

5. Complete mathematics for JEE main TMH.

I am also posting the link for your reference, it includes the best books for the preparation of JEE main 2020.

https://www.google.com/amp/s/engineering.careers360.com/articles/best-books-for-jee-main/amp

Hello Aspirant.

There are different books for different subjects that'll do wonders for you if you work on them with focus

Mathematics

1. R.D Sharma

2. R.S Aggarwal

3. S.L loney

Physics

1. H.C Verma

2. S.L Arora

3. Worksheet by Arihant publications

Chemistry

1. NCERT

2. OP tandon

3. R.C Mukherjee

If you're able to get all the concepts right from the above mentioned book then you'll be scoring really good in JEE mains.

Best od luck !