To effectively prepare for JEE in 8 months, focus on a structured approach:

analyze the syllabus

create a daily/weekly schedule

prioritize high-weightage topics

practice regularly with previous years' papers

And last but not the least maintain a healthy routine with adequate sleep and breaks.

You can check more detailed study plan here https://engineering.careers360.com/user/update-profile?destination=https://engineering.careers360.com/articles/how-prepare-for-jee-main-in-6-months