Colleges in Guwahati

Yes, you can pursue M.A. in philosophy after one-year gap. For information about the eligibility, click here:
https://www.shiksha.com/humanities-social-sciences/philosophy/course/m-a-in-philosophy-gauhati-university-guwahati-90322

It would be difficult if you are from general category to get into NLU-Sonipat with this rank but if you are from a reserved category then it will be a bit easy.

It would be easier for you if you are from some category but if you are from general category, it will be difficult for you to get into NLU.

If you are really interested in pursuing law as a career then take admission here only because it's about skills that you build and after your BA LLB. You can go for LLM after completing BA LLB. If you want, you can drop a year.

Eligibility:
A candidate must have completed Diploma in Engineering/ Technology with at least 45% marks.
Pass with 60% aggregate marks in Diploma (Engg.) (any stream) 3 years after 10th or 2 years after 10+2 (Non-Medical) or Diploma in Architectural Assistantship, B.Sc.(Non-Medical) or B.Sc.(Computer Science) or equivalent, subject to qualifying LPUNEST.
Click on this link:
https://www.lpu.in/programmes/engineering/b-tech-civil-lateral-entry

You should check the admission criteria of your dream college in which you want admission and you are eligible for M.Sc don't worry.