For important chapters you can visit my blog

It's name is tnpandav.blogspot.com Here you also get some notes and tips on how to crack jee mains exam and by which book you should prepare.

Here are some chapters you can prefer:

Mathematics

Complex Number , Quadratic Equations

Coordinate Geometry (straight line, circle and conic section )

Calculus ( function, application of derivatives, definite integration are most important part in calculus )

3-D and vector

bionomial theoem and Sequences and Series

Chemistry

Chemical Bonding and Molecular Structure

Chemical Thermodynamics

Electrochemistry

Inorganic Chemistry ( most important part for jee main )

Organic Chemistry( xiith class oganic chemisty is more imporant,full scoring )

Polymers and Bio Molecules

Environmental Chemistry

Chemistry in Everyday Life

Physics

Electrostatics

Current Electricity

Magnetic Effects of Current and Magnetism

Electromagnetic Induction and Alternating Currents

Optics

Dual Nature of Matter and Radiation,Atoms and Nuclei

Thermodynamics

Oscillations and Wave

Good Luck!