In Physics, Modern Physics, Heat and Thermodynamics, Optics, Current Electricity, Electrostatics are the most important chapters.
In chemistry, Transition elements and coordinate chemistry, periodic table and representative elements, thermodynamics and gaseous state are the important chapters.
In Mathematics, Coordinate Geometry, Limit, Continuity, differentiability, Integral calculus, complex numbers are the important chapters.
Maximum questions will be coming from these chapters.

For chpater wise marks distribution in JEE Main exam follow the given link-

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

Hello Deepak

It will be pretty tough to predict the chapter wise distribution but if you see this year JEE mains papaer then class 11 had more weightage than class 12 and it is somewhat same everytime.

In Physics 17 questions was from class 11 and 13 from 12. Same with Maths.

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