Sir iam studying intermediate 1st year, can you please explain the way for preparing jee mains exam and which books are helpful for studying

I would suggest you to go through with NCERT books as it will help you to make the basic fundamental strong. The other books you can prefer:

Books for Mathematics

Trigonometry by S. L. Loney

Higher Algebra by Hall & Knight

Maths XI & XII by NCERT

Co-ordinate Geometry by S. L. Loney

Problems in Calculus of One Variable by I.A. Maron

Books for Physics

Problems in General Physics by I.E. Irodov

Fundamentals of Physics by Halliday, Resnick & Walker

Concepts of Physics Vol I and II by H.C. Verma

Books for Chemistry

Organic Chemistry by Paula Bruice Yurkanis

Organic Chemistry by Morrison & Boyd

Inorganic Chemistry by J.D. Lee

Numerical Chemistry by P. Bahadur

Here are some preparation tips you can follow.

Make a plan to manage Time Well - Make a time table and devide your time in two parts first your study plan & secondly your daily routine works. Within stipulated time you should finish the syllabus. You must draw certain goals. Depending on the difficulty level of the chapter or the topic, You must decide for yourself in how many days you will be able to finish it. Before proceeding towards the new topic, you must ensure that you finish the previous one and Revise thoroughly.