Assam

I don't think you can get CSE in NIT Silchar even in the spot round.

Eligibility for getting admission in Punjabi University in M.Sc physics is
-Candidate have passed B.Sc. with Physics and Mathematics, the third subject may be any other, Chemistry/ Computer Science/ Electronics/ Computer Maintenance etc. or done B.Sc. (physics hons.)
-Admission is done on the basis of merit in qualifying class.

CS in triple it is better from Civil branch, because civil has no any scope in private sector versus very best score in private sector.

Triple IT-Guwahati is best, because it's placement is very good you can see its placement on official website Triple IT JEE. AC. In.

There are very low chances of your admission in these colleges because your rank is not good. You will get a NIT or good college if you belong to a SC, ST category. Please try JoSAA app on play store, and use it's college cutoff and college predictions.