JEE Main has certain very important sections, which need to be given extra attention for optimizing your marks. Some of them are as follows

1. PHYSICS

Modern Physics

Heat and Thermodynamics

Optics

Electrostatics and Current Electricity

2. CHEMISTRY

Coordination Chemistry

SPDF Block Elements

Electrochemistry and Solution Chemistry

Atomic Structure and Chemical Bonding

Organic : Alcohols, Aldehyde, Ketone, Acids

Aromatic Chemistry

Chemical and Ionic Equilibrium

3. MATHS

2D and 3D Coordinate Geometry

Differential and Integral Calculus

Probability and Statistics

Matrix Algebra and Determinants

Some of the Important Material which may help you in your feat of JEE Mains are as follows

1. RESONANCE Rank Booster

2. Arihant Chemistry Handbook

3. Allen Maths Handbook

4. P Bahadur Physical / OP Tandon Organic Book

5. DC Pandey Objective Physics JEE Main & Advanced

For more information do follow the link below

https://engineering.careers360.com/articles/most-important-chapters-of-jee-main/amp

For more information and weightage of all topics in JEE Main do follow the link below

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