hello aspirant,

Each year the chances of topics which form questions may change.also each shift it varies.so just studying most important might be a risky factor.studying according to weightage would be helpful.however studying full or according to weightage and going through most important topics again would be much more helpful to score better. You can refer to jeemain three subjects syllabus weightage physics chemistry and maths in the following link with subtopics: https://engineering.careers360.com/articles/jee-main-syllabus-weightage

also you can refer to most imporant topics and chapters : https://engineering.careers360.com/articles/most-important-chapters-of-jee-main remember nothing is impossible if you have the zeal.go and study hard so that you will thank yourself later.

hope this helps,

thankyou.

good luck.