Hello,
.
Firstly I will help you out with the important points to get your preparation done easily and in good way.
.

• Be familiar with the exam syllabus by knowing the units and topic's
• understand the exam pattern
• Go through old question papers
• Prepare a study plan
• Revise Evey topics thrice
• Attempt sample papers

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Let's come to the recommended books for preparation,
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Books for physics,

• Concepts of Physics Vol I and II by H.C. Verma
• Fundamentals of Physics by Halliday, Resnick & Walker
• Problems in General Physics by I.E. Irodov

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books for chemistry,

• Numerical Chemistry by P. Bahadur
• Inorganic Chemistry by J.D. Lee
• Organic Chemistry by Paula Bruice Yurkanis
• organic chemistry by Morrison and boyd

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Books for mathematics,

• Trigonometry by S. L. Loney
• Higher Algebra by Hall & Knight
• Co-ordinate Geometry by S. L. Loney
• Problems in Calculus of One Variable by I.A. Maron

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Now if you want any other information like dates , what's been changed , pattern etc etc please refer the below provided link. It will be more helpful.
. https://engineering.careers360.com/articles/jee-main

Hii aspirants

let me clear your doubt. to get the syllabus of jee main 2021, here is link for that

https://engineering.careers360.com/articles/jee-main-syllabus

through this link you will get all the details regarding syllabus of jee main 2021.

I hope my answer will help you out

Good luck

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