Hey Aashish! There is no particular weightage of topics from 11th standard syllabus in JEE Mains, but it covers nearly half of the paper. You can check the name of topics of 11th standard from the official website because the marks weightage for each topic changes every year which depends upon the body setting paper. Hope this may help you.

The trend slightly differs every year.

Visit the following link to get the analysis over years.

https:www.shiksha.com/b-tech/articles/weightage-of-class-11th-12th-subjects-in-jee-main-and-jee-advanced-exam-blogld-18985