which study material is useful for Jee main and advice please advise

There are several study materials available but you need to stick to few books and do them several times rather than several books once

I can suggest you these for your help

Important books for JEE MAIN

For Physics-

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

For chemistry-

• Numerical Chemistry by P. Bahadur
• Organic Chemistry by Paula Bruice Yurkanis
• Inorganic Chemistry by J.D. Lee
• Organic Chemistry by Morrison & Boyd

For mathematics-

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

NCERT is a basic must for the subjects.

Understand the concepts and do numerous problems on it and I would you to stop checking internet for trivial questions like- How to study for jee main and what is the best book-

You need to understand that everyone who cracked this exam had a unique approach and there is nothing like best book for any exam. You just need to keep giving several mock tests as well as previous year paper

Hope this helps !

All the best