Hey Gundlooru Navaz,

To prepare or score good marks easily in JEE mains first you need to concentrate on more weightage and important topics. Note down all main concepts and formulas in one seperate book. Practice all previous papers and mock tests! 

All the best!

Only few days are left over for JEE main therefore here are thumbs rule to boost your rank.

1 Don't go for any new topic just receive those in which you are strong.

2 Solve previous years questions from both JEE main as well as jee advanced and keep avoiding those books which covers questions outside syllabus

3 Focus on NCERT trust most of the questions will be directly based on that.