Hello aspirant

Getting 8000 rank within 4 months with somehow preparation in JEE mains is not enough. You still have 4-5 months legft in your pocket. YOu should exceed more. If you want to come under 8K rank in JEE mains, then you should need to focus and give  more time on solving previous year question papers, you must be more dedicated and consistent in solving more Questions from best reference books, you must practice more sums and must ficus only at your weak points.

Further, below are some of the best preparation strategy that you can follow if you want to lie within 8K rank in JEE mains :

Prepare A Well-laid Plan

Draft a daily schedule.

Prioritize the topics that require more time and relevant to the subject.

Stick to the routine and pay special attention to problems.

Get Hold Of The Syllabus

Manage your time effectively

Understand Basic Concepts

Before delving into JEE preparations, know the JEE syllabus and understand the basic concepts present in the syllabus.

Evaluate your knowledge on basic concepts.

Make notes on required topics.

Choose The Right Study Material

Further, follow and practice from the books mentioned below to ace yoru JEE mains preparation smoothly :

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

Further, For more information and complete details about the JEE mains tips and strategies and about the subject wise weightage in JEE mains, you can follow the belwo link :

https://engineering.careers360.com/articles/jee-main-preparation-tips

I hope that this will help.