JEE Main is one of the most important examination for engineering aspirants. So before start preparing, you should know the chapterwise weightage. In physics, most important subjects are- modern physics, heat and thermodynamics, optics, current electricity, electrostatics, magnetics.
In Chemistry, Transition Elements and Coordination Chemistry, Periodic table and Representative Elements, Thermodynamics And Gaseous State, Atomic Structure, Chemical bonding are the most important chapters.
In Maths, Limits, Continuity and Differentiability, coordinate geometry, integral calculus, Complex numbers and Quadratic Equation, Statistics and Probability, Three Dimensional Geometry, vector algebra are important chapters.

Go through the link for detailed information-
https://engineering.careers360.com/articles/jee-main-syllabus-weightage

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