1) cut off for general caste students. 2)is there really 5 subjective questions in each subject. 3)is there chapter wise mark allotment available for each subject. 4) eligibility for a student to crack jee mains and advanced.

Dear Aspirant,

According to last year cutoff for general category was 89.75 percentile .And there is no official weightage for Jee mains declared by Nta. It is also not fixed that there are how many numerical question and subjective question. If you want to write Jee mains then you should have PCM in 12th
For general category you should have 75% in class 12 to get admitted in nit ,Iiit.
To be eligible for Jee advanced your jee main cutoff must be cleared .
Here I am providing some links through which you can get every solution related to your question.

https://engineering.careers360.com/articles/nits-cutoff-for-top-btech-branches

https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-exam-pattern

Thanks

All the very best