M.Tech

Defence Institute of Advanced Technology - DIAT
Girinagar, Haveli Pune, Maharashtra (020) 24389318, 24389411 (020) 24304021, 24304424
Courses Offered
M.Tech. (Mechanical (weapons)
M.Tech. (Automotive Engineering)
Ph.D. (Mechanical Engineering).

2-3 Lacs is the fees of the course.

If we talk about B.Tech then it is fine to do from private university but renowned, M.Tech from IITs need certain criteria for that, you have to prepare well during graduation. For B.Tech you can try for SRM University, Lovely Professional University and Amity University as you need to groom your skills much so that you do not face concern after M.Tech.

It depends on your skills and experience. However, around 5 to 6 Lacs per annum you will get after completing your B.Tech + M.Tech in nanotechnology.

No, JNU does not offer, M.Tech in civil engineering, for the list of courses, check out the link below:
https://www.shiksha.com/university/jawaharlal-nehru-university-delhi-4225/courses?bc[]=86

Nowadays, the same problem occurs to many students. The fact is it is not easy to get government jobs nowadays. You can prepare for government job but do not sit ideal just thinking that you will get government job. I would recommend you to go for M.Tech side by side. As your year will not be waste and you will prepare yourself for government job and aloo for M.Tech. While applying for M.Tech make sure you will get admission in IIT or NIT or some top private institute. It will be waste of M.Tech if you go for low level colleges.

Regarding placements, you will not be eligible for almost 80% of the companies which the B.Tech students are eligible for. This may/may not change by the time you reach your final year. So keep your fingers crossed.
But that being said, you will still get a lot of decent opportunities and that includes super dream offers (10+LPA) from:
Paypal
DeShaw
Morgan Stanley
Direct
Thorogood
SAP
Amazon, etc. and also dream offers (410 LPA)
Zoho
Hitachi
MuSigma, etc.

Regarding placements, you will not be eligible for almost 80% of the companies which the B.Tech students are eligible for. This may/may not change by the time you reach your final year. So keep your fingers crossed.
But that being said, you will still get a lot of decent opportunities and that includes super dream offers (10+LPA) from:
Paypal
DeShaw
Morgan Stanley
Direct
Thorogood
SAP
Amazon, etc. and also dream offers (410 LPA)
Zoho
Hitachi
MuSigma, etc.

There are many other private institutes. They are flexible with dates. Go through them.
Best wishes.