Hi Shivam,

Every topic, every chapter is very much important and are of much marks in mathematics. The British form maths chapters in JEE mains are as follows.

1) Co-ordinate Geometry , 20 marks, 5 questions

2) Limit , Continuity and Differentiability, 12 marks, three questions

3) Integral Calculus 12 marks , three questions

4) Matrices and Determinants 8 marks, 2 questions

5)  Complex Numbers and Quadratic Equation, 8 marks , 2 questions.

For more information you can go to the link given below.

Link :- https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-syllabus-weightage/amp

I hope your question has been answered properly.

All the best for your future!