Ok, here I am providing you some best exam preparation tips for IIT Joint Entrance Exam JEE exam. It you follow these, then I think you will definitely clear the exam with good scores.

IIT JEE Exam preparation tips-

The very first step is to get focused.

Only a concentrated, industrious, and planned study plan will yield the desired score and rank.

Study at least 5-6 hours a day, seriously.

Create a timetable which should have equal distribution of hours for each subject.

Solving a variety of difficult questions

Judging your performance on difficult questions

Time management is an important factor in JEE Main. So, while solving model JEE question papers, keep an eye on your watch too.

Make sure you can solve problems from the NCERT class XI and class XII textbooks.

Best Books-

Mathematics:

Make sure you can solve problems from the NCERT class XI and class XII textbooks.
For best concepts, use IIT Mathematics for JEE (Main and Advanced) by M.L. Khanna
For the most abundant supply of difficult questions: New Pattern IITJEE Mathematics by Dr. S.K. Goyal
Plane Trigonometry and Elements of Coordinate Geometry by S.L. Loney

Physics:

Concepts of Physics, Volumes 1 and 2, by H.C. Verma
Problems in General Physics, by I.E. Irodov
Fundamentals of Physics, by Halliday, Resnick, and Walker
Understanding Physics for JEE Main and Advanced (series), by D.C. Pandey

Chemistry:

Study the NCERT chemistry textbooks for classes XI and XII.
Organic Chemistry, by Morrison and Boyd
Numerical Chemistry for JEE Main and Advanced, by P. Bahadur
Concise Inorganic Chemistry, by J.D. Lee
Modern Approach to Chemical Calculations, by R.C. Mukherjee
Physical Chemistry, by P. Bahadur.
organic, physical, and inorganic chemistry books by O.P. Tandon