For jee mains
Please refer the link below to access the chapter wise  weightage  of each subject:

https://www.embibe.com/exams/jee-main-important-chapters/amp/

All the best!!!

https://gradeup.co/jee-main-syllabus-pattern-weightage-i-bca9ffd0-48df-11e6-8481-b4697555ecf6

Check this for more details.

Important topics :

Heat and thermodynamics
Ray optics
Electromagnetic waves

Atomic structure
Chemical kinetics
Electrochemistry

3d geometry
Determinants and matrices
Sequence and series

If you are preparing for JEE Mains Exam you can prepare from the followings topics that will help you to prepare for JEE exams

 

I am providing the important topics in Physics Chemistry & Mathematics

 

Electrodynamics- 8 questions 28 marks 22.58% weightage

 

Heat & Thermodynamics- 5 questions 16marks 12.90% weightage

 

Mechanics- 9 questions 31marks 25.00% weightage

 

Modern Physics- 7 questions 23 marks 18.55% weightage

 

Optics- 5 questions 18marks 14.52% weightage

 

As,the JEE Advanced Syllabus 2018 is vast its important to prepare the important topics to score well in the exam

 

Chemistry

 

In organic Chemistry | 5 QUESTIONS 19 MARKS

 

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Chemical Bonding- 2 que 8 marks

 

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p-block --3 que 11 marks

 

In organic Chemistry || 5 que 17 marks

 

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Coordination Compounds- 2 que 6 marks

 

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Metallurgy- 1 que 4 marks

 

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Qualitative Analysis- 2 que 7 marks

 

Organic Chemistry - | 12 que 42 marks

 

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General Organic Chemistry- II 1 4

 

Organic Chemistry -||1 4

 

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Alkyl Halide, Alcohol & Ether (Reaction Mechanism)- 1 que 4 marks

 

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Amines- 1 que 4 marks

 

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Aromatic Compounds -1 que 4 marks

 

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Biomolecules -1 que 4 marks

 

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Carbonyl compounds-1 que 3 marks

 

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Grignard Reagent, Reduction, Oxidation & Hydrolysis- 2 que 6 marks

 

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Polymers -1 que 3 marks

 

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Practical organic chemistry- 2 que 8 marks

 

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Stereoisomerism -2 que 6 marks

 

Physical Chemistry-| 7 que 21 marks

 

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Atomic Structure & Nuclear Chemistry- 1 que 3 marks

 

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Chemical Equilibrium -2 que 6 marks

 

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Gaseous State-1 que 3 marks

 

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Mole Concept- 3 que 9 marks

 

Physical Chemistry-|| 6 ques 22 marks

 

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Chemical Kinetics -2 que 8 marks

 

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Electrochemistry -1 que 3 marks

 

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Solid State -1 que 4 marks

 

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Solution & Colligative Properties- 1 que 4 marks

 

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Surface Chemistry -1 que 3 marks

 

Mathematics

 

Vector & 3D- 3 question 11 marks

 

8.87% weightage

 

Trigonometry- 3 questions 10 marks

 

8.06 % weightage

 

Matrix & Determinants -4 questions 14 marks

 

11.29% weightage

 

Integral Calculus- 6 questions 21 marks

 

16.94% weightage

 

Differential Calculus- 5 question 19 marks