You will find all information regarding the weightage of topics of PCM in JEE Main in the link below

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

However, I would suggest you to prepare all topics strongly and prepare all three of Physics, Chemistry and Mathematics for an excellent performance in JEE Main.

Hi

Based on analysis of past year question papers of JEE Mains chapter wise weightage for JEE mains 2021 is provided below subject - wise

PHYSICS

*Modern Physics:- 20 marks
*Heat and Thermodynamics :- 12 marks
*Optics:- 12 marks
*Current Electricity :- 12 marks
*Electrostatics :- 12 marks
*Magnetics :- 8 marks
*Unit, Dimension and Vector:- 4 marks
*Kinematics :- 4 marks
*Laws of motion :- 4 marks
*Work, Power and Energy :- 4 marks
*Centre Of Mass, Impulse and Momentum :- 4 marks
*Rotation :- 4 marks
*Gravitation :- 4 marks
*Simple Harmonic Motion :- 4 marks
*Solids and Fluids :- 4 marks
*Waves :- 4 marks
*Electromagnetics Induction ; AC :- 4 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
* Solid State And Surface Chemistry :- 4 marks
* Nuclear Chemistry And Environment:- 8 marks
* Mole Concept :- 4 marks
* Redox Reaction :- 4 marks
* Electrochemistry :- 4 marks
* Chemical Kinetics:- 4 marks
* Solution and Colligative Properties :- 4 marks
* General Organic Chemistry:- 4 marks
* Stereochemistry:- 4 marks
* Hydrocarbon :- 4 marks
* Alkyl Halides :- 4 marks
* Carboxylic Acid and their Derivatives:- 4 marks
* Carbohydrates,amino acid and Polymers :- 4 marks
* Aromatic Compounds :- 4 marks

MATHS

* 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
* Sets, Relation and Function:- 4 marks
* Permutations and Combinations :- 4 marks
* Binomial Theorem and Its Application:- 4 marks
* Sequences and Series:- 4 marks
* Trigonometry :- 4 marks
* Mathematical Reasoning :- 4 marks
* Differential Equation :- 4 marks
* Statics and Dynamics :- 4 marks
*  Differential Calculus :-  4  marks

You can check the same and have more information at our page,  the link for the same is provided below

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

This chapterwise weightage  will help you a lot lot in  planning your studies for your jee main examination, you can comparatively focus more on chapters having higher weightage.

Thank you