• 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

• 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

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

• 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

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