I want to give the exam of IIT JEE and for that I want to get the details of chapters which are regarded as important in the exam of IIT JEE so can you provide me that?

As you want to get the details of chapters which are regarded as important in the exam of IIT JEE so here is the information of the same for you:

In PHYSICS

1.Mechanics
2. Fluidics
3. Electrostatics
4. Electromagnetism & EM Waves
5. Nuclear physics

CHEMISTRY

1. Inorganic chem - entire
2. States of Matter
3. Mole concept
4. Atomic structure and nuclear chemistry (some part overlaps with nuclear physics)
5. Chemistry in everyday life

MATHS

1. Permutations-Combinations
2. Binomial theorem
3. Matrix Determinants
4. Differentiation & Differential Eqns.