Hello yasaswi ,thanks for asking this question on this platform.the weightage of each chapters in JEE main can be get in any good previous year book like Arihant 15 years solved by Arihant publisher if you want a hard copy .and you can also refer the following...

https://engineering.careers360.com/articles/jee-main-syllabus-weightage/amp

Hello Dear
Yeah definitely you can get it to know. Infact there are few topics also in JEE mains through which you can able to fetch the more number of marks in Mains in all the three domain i.e PCM. Below the link is given through which you can check all those important topics .
https://engineering.careers360.com/articles/jee-main-important-topics-books
All the best

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