Hello Ankur,

Syllabus for JEE-Advance examination is described below :-

• Chemistry

1. Gaseous and Liquid States
2. Atomic structure and bonding
3. Energetics
4. Chemical Equilibrium
5. Electrochemistry
6. Chemical Kinematics
7. Solutions
8. Surface Chemistry
9. Nuclear Chemistry

• Physics

1. Mechanics
2. Thermal Physics
3. Electricity and Magnetism
4. Thermal Physics
5. Optics
6. Modern Physics

• Mathematics

1. Algebra
2. Matrices
3. Probability
4. Trigonometry
5. Analytical Geometry
6. Differential Calculus
7. Integral Calculus
8. Vector

For more detailed syllabus you can read JEE-Advance 2020 Syllabus .

JEE-Main syllabus is discussed below :-

• Chemistry

1. Some basic concepts in Chemistry
2. States of Matter
3. Atomic Structure
4. Chemical bonding
5. Chemical equilibrium
6. Thermodynamics
7. s, p, d&f block elements
8. Redox reaction and electrochemistry
9. Chemical Kinetics

• Physics

1. Physics and measurements of units
2. Mechanics
3. Thermal Physics
4. Electricity and Magnetism
5. Optics
6. Modern Physics

• Mathematics

1. Algebra
2. Matrices
3. Probability
4. Trigonometry
5. Probability
6. Permutations and Combinations
7. Differential calculus
8. Integral calculus
9. Vector

For more detailed syllabus of JEE-Main examination read JEE-Main 2020 Syllabus .

Hope this answer helps you.

Good Luck!!