Hello dear,

Chapter wise weightage for jee mains for 2022 by nta will make preparation better. There is 65 questions in total for the jee exam with maths ,physics,  chemistry  each 25 questions each .Every year there is variation in jee main syllabus and weightage. You can the link given below to get complete detail about the weightage and syllabus

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

Hope this information is helpful to you

Good wishes