Below are the topics which you can focus for your JEE Main preparation which carries more weightage in the exam according to 2017 anaysis

Physics

Current Electricity- 10%

Capacitor- 6.67%

KTG & Thermodynamics- 6.67%

Work Power and Energy- 6.67%

Rotational Dynamics- 6.67%

Modern Physics- 13.33%

Chemistry

Chemical Bonding- 6.67%

Complete P-Block- 6.67%

Halogen Derivative- 10.00%

Mole Concept- 6.67%

Mathematics

Sequence & Series- 6.67%

3-D- 6.67%

Probability- 6.67%

Tangent & Normal- 6.67%

All the Best for your Preparation!!