Dear student,
The important topics for each subject are as follows:

Physics

Rotational Motion

Thermodynamics

SHM

Electrostatics

Magnetism

Optics

Modern Physics

Mathematics

Complex Number

Conic Section

Circle

Calculus

Vector & 3 D

Probability

Trigonometric Equation

Properties of Triangles

Quadratic Equation

Sequence and Series

Permutations and combination

Chemistry

Chemical bonding

Electrochemistry

Coordination compound

Salt analysis

Ionic equilibrium

Thermodynamics & thermochemistry

Aldehydes and ketones

Aromatic hydrocarbons

GOC isomerism

Liquid solutions

Alkyl halides and aryl halides

For more info you can visit the following link:
https://engineering.careers360.com/articles/most-important-chapters-of-jee-main

Hello Aspirant,

See as we know that now very few time is remaining for JEE-Main 2021 so from now you should give more focus to those chapters which have higher weightage as compare to that of others so I am enlisting down them for your reference :-

@Physics

Modern Physics - 20 marks

Heat and Thermodynamics - 12 marks

Optics - 12 marks

Current Electricity - 12 marks

Electrostatics - 12 marks

Magnetics - 8 marks

@Chemistry

Transition Elements and Coordination Chemistry  -  12 marks

Periodic table and Representative Elements - 12 marks

Thermodynamics And Gaseous State- 8 marks

Atomic Structure - 8 marks

Chemical Bonding - 8 marks

Chemical And Ionic Equilibrium - 8 marks

@Mathematics

Coordinate Geometry  -  20 marks

Limits, Continuity and Differentiability - 12 marks

Integral Calculus - 12 marks

Complex numbers and Quadratic Equation - 8 marks

Matrices and Determinants - 8 marks

Statistics and Probability - 8 marks

Vector Algebra - 8 marks

For more detailed syllabus and its weightage for JEE-Main 2021 kindly check out the link given below :-

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

I hope this information helps you.

Good Luck!!

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