Dear Vinay,

In order to score good marks in JEE Advanced it is very important that your concepts are clear any you build strong fundamentals.You can take help of NCERT books. 

You can check the topics below which are important for your preparation

Physics

Mechanics

Electricity and magnetism

Thermal physics

Fluids and waves and sound

Potentiometer-related experiments

Optics

Modern physics

Chemistry

Mole Concept:

Atomic Structure

General Organic Chemistry

Named Reactions

Inorganic Chemistry

Mathematics

Calculus

Co-ordinate Geometry

Vectors (and 3D Geometry)

Algebra

Trigonometry

You should also refer to previous year papers to understand the exam pattern and to know the level of the exam. Solve as many as mock test series as well for your practice.

Good Luck!!