assume that I got upto 100 rank in jee main 2021. Can I take admission in NIT Trichy because I got 63% in MP Board

Dear student,

The admission in all the nits are given on basis of jee mains rank.
If you are a general category student and have secured a hundred rank in in JEE Mains then you can easily get NIT Trichy and you can get any branch of your choice.

With this much rank in JEE Mains you can get any NIT or IIIT, not just only nit trichy. But you must pass the eligibility criteria of NIT to get a seat.

The eligibility criteria is -
You must qualify jee mains ( kf courses with very good ranks), and
If you are a general category student then you must pass your class 12th Board examinations with 75 percent or above.
Or if you are a SC / ST category student then you must pass your class 12th board exams with at least 65 percent.

If you secure a very good rank in jee mains but didn't pass the class 12th with 75% score ( for general) or with 65% score ( for sc / st ) then you will not get any seat in nit trichy and it doesn't matter that from which board you are, you will still be disqualified if you didn't pass any one of the eligibility criterias.