JEE mains exam pattern is of duration of 3 hours and total marks of 360, mathematics, chemistry and physics each of 30 questions. Click on the following link for important chapters for JEE mains-

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https://engineering.careers360.com/articles/jee-main-syllabus-weightage

JEE MAIN ask questions from almost all the chapters but few chapters are more important compared to others therefore here are the list of important chapters from different subjects

Physics important chapters includes electrostatics rotational motion.

Chemistry important chapters are electrochemistry chemical bonding basic organic chemistry

Mathematics important chapters are calculus cordinate geometry.