Hi,

Since you are in class 11th, you have enough time to prepare well for you JEE. The key to crack entrance exams is consistency you must focus on regular practice and clearing basic concepts from NCERT first after which you can refer to several books.

You must also focus on preparing topics according to the weightage they carry in the final exams.

Additionally you can refer to the following books for practice:

JEE Main Books Important for Mathematics

Trigonometry by S. L. Loney

Higher Algebra by Hall & Knight

Maths XI & XII by NCERT

Coordinate Geometry by S. L. Loney

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

JEE Main 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 JEE Main Chemistry

Organic Chemistry by Paula Bruice Yurkanis

Organic Chemistry by Morrison & Boyd

Inorganic Chemistry by J.D. Lee

Numerical Chemistry by P. Bahadur

For more details and tips you may consult this link: https://engineering.careers360.com/articles/jee-main-preparation-tips

All the Best!!

I hope this helped you.