MNNIT Allahabad - Motilal Nehru National Institute of Technology

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.

You have to take NIMCET exam then you will get a college according to your rank.

No, chances are very low for you to get admission MNNIT with this rank.

Yes, in all NITs, national level institutes or central funded institutes admissions are done on the basis of JEE mains merit ranking.

I am sorry to say but admission in MNNIT is done through JEE Mains only. Also, the candidate should opt for PCM in class 12th.
All the best.

Hi Dear,
Kindly use the JEE Mains college predictor app to get more insights about the shortlisted colleges for your JEE Mains score. https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor