M.Tech

No, you will get only VIT, Chennai or Bhopal or Amravati in that much rank but you can get civil branch in VIT, Vellore that too in a higher category.

Dear student, Vellore Institute of Technology is a private deemed university with rank 9 under the "Engineering" category (NIRF). It offers a 5-year integrated postgraduate programme (M.Tech. In software engineering). As of now, there is no entrance exam-based criteria for this particular course. To be eligible, you must have passed the Higher Secondary Examination conducted by the State or Central Board of Secondary Education.

You will be getting CSE and all other specializations offered by VIT with CSE  in the VIT VELLORE campus.

The course fee structure for B.Tech in Computer Science and Engineering is 7.80 Lacs in VIT Vellore.

All courses fee structure range from 6.92 Lacs to 7.80 lakhs.

Yes, you have got a decent rank but it would not be sufficient to fetch you an integrated M.Tech seat in software engineering under category 1 at Vellore campus of VIT. You can possibly get it in second category but chances of it are slim as seats are limited and the mentioned course is most common choice in integrated programme. The best possible options are:
Integrated CSE at Vellore (1 or 2), Integrated CSE with specialisation in Data Science at Vellore (Category 1 most probably else in second category), Integrated CSE at Chennai (category 1), Integrated CSE with specialisation in business system at Chennai (Category 1).

 The private colleges for M.Tech in agriculture and food processing in India:

1.GITAM VIZAG

2.HBTU KANPUR

3.JAIN UNIVERSITY

4.COLLEGE OF TECHNOLOGY

5.FACULTY COUNCIL OF ENGINEERING AND TECHNOLOGY-JADAVPUR UNIVERSITY

You have great opportunities by joing VIT Andhra Pradesh for integrated M.Tech course. Any parent who thinks there won't be any recognition for this programme, which is not true. By 5 years integrated M.Tech programme the student directly gets a post graduate degree. When it come to placements, these students have it along with B.Tech students in the fifth year. Moreover, a few companies offer more salary to M.Tech integrated students.

Yes, you can do M.Tech in Computer Science after B.Tech in robotics and automation engineering. My suggestion is to research which interests you before you choose a path for your PG degree. Since M.Tech in computer Science has a good scope in the future it's better to do the course after your current B.Tech.

Yes, M.Tech. in Environmental engineering is offered by DBATU you can take addmission to it.

The fee structure for M.Tech. in Environmental Engineering at Dr. Babasaheb Ambedkar Technological University for Open is Rs. 1,35,000, for SC/ST is Rs. 67,500 and for PwD is Rs. 1,12,500.