Agartala

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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.

NIT Agartala is the Second Best after Silchar in NE states. Thus as per my view I would suggest you to go for SILCHAR -NIT is the best in terms of Placement
Infrastructure, Environment. Etc. Thus this purely on my views and as per this factor.

As per your question, you should go for NIT-Silchar. It has good placements and infrastructure as per other NIT in NE. NIT has a good environment and infrastructure and with fair placement records, among the other NIT in Northeast and after NIT Silchar comes the second that is NIT Agartala.

Go for Osmania University if you don't want in the NE states. Osmania University is all good in terms of many aspects and comparable to NITs of NE.
First of all, every college is good. Everything depends on the students and how he/she is. Thus as per the question, my answer will be if you choose NIT, then go for Agartala or Silchar, else choose OSMANIA University.

I would Suggest to go for NIT Silchar for mechanical or even Agartala is also better option among all as per my view as NIT - Agartala and NIT- Silchar have a good placement as per last 3year track record. And thus, the question for your answer is Silchar NIT is best for Mechanical as per view.

I think you should do CS IT from iiit Gwalior. But it also depends upon your convenience and interest. You can get insight of both and then take decision. Best of luck.

Actually, the fee of all NITs is not same even semester fee of NIT-Agartala is not same as the hotstel fee of all semsters. It is 18000 (including mess) and tuition fee varies according to the semester, but approximately INR 70,000 per semester (after batch 2015_19) because the policy of MHRD has been changed from 2016, but if your family income is less than 1.5 lakhs then you need to pay the half of tuition fee.