Hi Tiyasa,

The main topics that are the most important for JEE Mains are as follows:-

@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
• Solid State And Surface Chemistry - 8 marks
• Nuclear Chemistry And Environment - 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
• Three Dimensional Geometry - 8 marks
• Vector Algebra - 8 marks

Refer here for more info - https://engineering.careers360.com/articles/jee-main-syllabus-weightage

Feel free to ask doubts in the Comment Section.

I hope this information helps you.

Good Luck!

Dear candidate

The weightage of JEE MAINS for both engineering and architecture the topics which have more weightage are very important in terms of examination and the topic wise weightage in all the three subjects is available so, check the weightage for JEE Mains syllabus by visiting  the below mentioned link

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

Hope this Information is helpful