MNNIT Allahabad - Motilal Nehru National Institute of Technology

For general category:
Home Board 3476
State Board 4731
For OBC NCL:
Home Board 1310
State Board 1589
For SC category:
Home Board 810
State Board 1140
For ST category:
Home Board 647
State Board 812

You can go through the official website for this www.mnnit.ac.in

According to my knowledge, there is no Diploma in MNNIT.

I don't think there is any Diploma course in MNNIT, only degree course are available.

You need to complete 12th in order to apply for B.E or you can go for Diploma.

First of all you have to clear JEE Mains with a good rank under 10k if you want to get into MNNIT with general category but here is no guarantee of getting your favorite branch. For this, you have to work hard.
Once your rank is out, wait for counseling and then fill the colleges in the priority you want to go to.
But at this time, I would suggest you to work hard and try to score as much marks as you can. "Do not shrink yourself to not only try, may be you will get a good IIT also.
Best of luck.

It depends upon the category and cut-off of JEE Mains examination. But a minimum of 180 marks are required by a general category candidate.

No, admissions in School of Management Studies, MNNIT are done only through CAT (conducted by IIMs) followed by GD and Personal Interview.

I don't think that B. Arch is there in MNNIT especially at undergraduate level. I can't say clearly about post-graduation. But I strongly think that you have confused between MNIT to MNNIT. So please review it.

MNIT is one of the top NITs. So, for every branch MNIT is far better than Silchar.