Hello! Hope you are doing good.

As you've not mentioned which exam so I'll consider it to be mains. So please make it clear that the number of questions varies every year but a rough estimate cna be taken out from the trends. So, prepare most of the weighted topics very well.

Please refer to the following link for the detailed description of weightage of chapters: https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-syllabus-weightage/amp

All the best