As per your request here I am providing you information about the Most Important Chapters for JEE Advanced in Mathematics, Physics as well as Chemistry.

JEE Main Mathematics Important Topics
Vectors & 3D Geometry

Application of Derivatives

Functions, Limits, Continuity & Differentiability

Differential Equation

Permutation & Combination

Circle, Parabola, Hyperbola in Coordinate Geometry

Sequences

Complex Number

Matrices in Algebra

Determinants

Quadratic Equations & Expressions

Definite Integral in Calculus

Quadratic Equation

Definite Integration

Probability

JEE Main Physics Important Topics
Mechanics

Conservation Laws

Magnetics

Heat and Thermodynamics

Radioactivity

Work,Power, Energy

Rotational Motion

EMI

Nuclear Physics

Semiconductor

Electrostatics

Dynamics

Theory of Fields (Electromagnetism)

Waves and Sound

Fluids

Optics

Modern Physics

Capacitors

JEE Main Chemistry Important Topics
Redox Reactions

Electrochemistry

Chemical Kinetics

GOC

P Block Elements

Qualitative Analysis

Thermodynamics

Chemical Equilibrium in Physical Chemistry

Coordination Chemistry & Chemical Bonding in Inorganic Chemistry

Organic Chemistry