It is according to the past year analysis but it can be vary for JEE Main 2018.

It is not compulsory that number of questions asked in each topic in 2017 will be same for 2018 it can be changed.

It is given to give you idea about the important topics. So, that you can prepare accordingly to score good marks in your exam.

You can solve previous year questions to get an idea about the pattern and level of questions.

You can check the important topics for JEE Main according to the 2017 paper analysis

Physics

Capacitance- 6.67%

Current Electricity- 10.00%

Calorimetry & Thermal Expansion- 6.67%

KTG & Thermodynamics- 6.67%

Rigid Body Dynamics- 6.67%

Work, Power & Energy- 6.67%

Modern Physics- 10.00%

Chemistry

Chemical Bonding- 6.67%

S-Block- 6.67%

Alkyl Hallide, Alcohol & Ether (Reaction Mechanism)- 13.33%

Mole Concept- 10.00%

Mathematics

Co-ordinate Geometry (3-D)- 6.67%

Application of Derivatives- 6.67%

Functions- 6.67%

Matrix & Determinants- 6.67%

Probability- 6.67%

Good luck!!