To get best result in JEE Main you should throughly read NCERT book as syllabus is based on them and it will help you to clear your base. Building strong concepts are very important to crack JEE Main exam.

After, NCERT you can recommended below books for your preparation

Physics

HC Verma

DC Pandey

I.E. Irodov

Resnick, Halliday, Walker

Chemistry

Organic Chemistry- Morrison Boyd/ O.P Tandon

Modern Approach to Chemical Calculations- R.C. Mukherjee

Numerical Chemistry- P. Bahadur

Concise Inorganic Chemistry-  J.D. Lee

Mathematics

R.D. Sharma

Trigonometry, Geometry Books- S.L. Loney

Higher Algebra- Hall and Knight

Make sure you solve previous year papers and complete mock test seres as well.

Good Luck!!