Dear Aspirant

There is no such fixed no of question asked In jee from NCERT .But if you read ncert thoroughly in depth then definitely you can score good marks.Try to solve numericals which are given behind every chapter in ncert.You have to focus on topics which are unique for example Carbon code resistor from class 12 th. Before giving exam try to revise all the formulae and concepts in one go so you will not  hesitate during exam

If you want to know about important information regarding Jee Main then you can visit the link mentioned below

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

Thanks

All the very best