hii Ishu,

  if you want to score 40+ marks in JEE main then you should focus on the given chapters-

       1)sets,Relation and function.

       2)matrix and determinant.

       3)sequence and series.

       4)statistics and probability.

       5)Trigonometry.

except these you will have to also practice some differentiation and integration questions because in JEE main questions asked are not belongs to single topics.one question may covers three or more chapters. and many of them conatains calulus.

also if you can then please go through the binomial theorem,permutation and combination.

and also i suggest you to cover some previous year Question paper.this will be very usefull for you.

thank you.

Hello Ishu

There are some chapters which are the important :

Sequence and series

Permutations and combinations

Geometry

Statistics

Trignometry.  etc.

But you can not depend upon only some of the topics because anything can happen.

It may be possible that question from these topics come in exam may be lengthy and difficult . So if you are prepared with other topics you can cover it.Sometime we do silly mistakes which lead us to a wrong solutions so better to prepare with full syllabus.

Good luck