Hello,
.
Firstly I will take a pleasure to mention that NCERT book of 11 and 12 or even add 10 are one of the best books to start your preparation with.
.
Now after getting perfectly done with Those books give a reference and focus on below mentioned books,

Physics,

• Concepts of physics by  H.C verma
• Fundamentals of physic by halliday and walker
• Understanding physics by DC pandey
• Problem in general physics by I.E iirodo

Chemistry,

• Modern approach to chemical calculation  by R.C mukherjee
• Organic chemistry by O.P tandom
• Concepts of physical chemistry by P bahadur

Maths,

• Objective mathematics by  RD Sharma
• plane  trigonomentry by loney
• The elements of coordinate geometry by Loney

Upto here your half preparation is done.There is much more to get done.
please follow the provided link for brief and clear details.

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

This will surely help you out for more topics to get prepared  and it gives you what are important topics to remember.
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Once you get done with this..Your preparation is fully completed.Dont forget to make a time.
Table for preparing accordingly.
.
thank you

Hello Dear Aspirant,

The JEE Mains exam covers 40% of syllabus from class 11th standard and 60% of the syllabus from 12th standard approximately. The best books for preparation of JEE 2020 if you want to start now :

Physics : NCERT and Pradeeps's fundamental for Physics

Chemistry : Read NCERT and read it thoroughly.

Mathematics : R D Sharma and IA Marron for basic concepts

I hope this is helpful
Best Wishes!

Hey there

You have now less time left so I'll suggest you to first complete your coaching materials and notes.

For physics HC VERMA will be best.

For chemistry NCERT and for practice previous year questions of JEE, AIIMS etc

For maths NCERT EXEMPLAR, Rd Sharma and focus on calcus and co-ordinate

Good luck

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