Hi Debadip,
Some of the easy topics in Mathematics would be
Differential Calculs, Vector Algebra, 3-D and Matrices, Progressions, Quadratic Equations.
Prepare these topics well. This will constitute a good chunk of the part of the JEE Paper. Though to be on the safer side, after preparing with these topics, you should study thr rest of the chapters as well.
Wish you all the best.
Regards,
Ashwin (IIT Madras).
