Dear Pavan

Pavan the weightage which has been decided by the authorities of NTA has been fixed and to the mark. Since they have varied a lot in the mock test doesn't mean that the actual  paper will be like that. The format will be same only as they have presented . So don't worry about that more only just follow the prescribed instructions and marking scheme which they have mentioned. Below the link is given through which you can able to check the further details in that .

https://engineering.careers360.com/articles/jee-main-exam-pattern

All the best

There is nothing mentioned in the JEE mains that the exam will definitely consist of that much percentage of that topic.
The weightage of topics are decided by only on prediction from previous year papers.
Only
The syllabus is mentioned in the JEE mains PDF file.
So don't give exam with such myth that the exam will definitely consist  this topic.
Prepare all the topics well

Good luck

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