hi,

the students who are seeking admissions in IIT/NIT/ any other top engineering colleges should have minimum 75% marks in their board examination.for sc/st candidates can have 65% of marks.

for architecture courses, the students must have 50% aggregate marks in theri board exam.

there is no age limit for JEE MAIN and no other eligibility to appear for JEE,you should be passed in your +2 or equivalent board exam. thats it.for further details you can refer below link:

https://engineering.careers360.com/exams/jee-main

I Hope this information will be useful to you.

if you need additional information,let us know to help you.

Thank you!!!:)