M.Tech

Yes, you can join M.Tech in computer science, you need to attempt the entrance exam of CSE. My suggestion is to go for a regular college to pursue M.Tech, distance learning is not advisable and doesn't have much value.

Hello there,
You can appear for GATE and as per your score you will get a call from the various colleges accordingly.
All the best.

To be on the safe side you need to score 60% marks in MET. All the best.

Top M.Tech in Civil Engineering colleges in Hyderabad includes:
1. IIT Hyderabad
2. IIIT Hyderabad
3. BITS Hyderabad
4. Osmania University
5. Jawaharlal Nehru Technical University
You can find the complete list of colleges at:
https://www.shiksha.com/engineering/colleges/m-tech-colleges-.

No, Those who have completed BE or B.Tech are eligible to study M.Tech. Since, You completed your B.Sc. I would suggest you to go with M.Sc.

Eligibility Criteria:
BE Chemical Engineering / B.Tech Food Technology / Biotechnology / Biochemical Engineering / Agricultural Engineering.
Admission Guidelines:
Selection of the candidates to various disciplines of ME and M.Tech programmes will be done on the basis of their performance in the entrance examination and interview. Both are conducted by the university.

Yes, for M.Tech in Chemical Engineering eligibility criteria is 60% or above in relevant discipline at Graduation level. For more details kindly go through University website or this link:
https://www.galgotiasuniversity.edu.in/m-tech-in-chemical-engineering.asp

After B.Tech in computer Science, that won't be possible as basic eligibility to take admission in this course is graduation i.e. BE/B.Tech in aerospace or allied specializations. Admission to this course is done through GATE in most of the engineering colleges in India. Course fee ranges from INR. 2 Lacs. to INR. 4 Lacs.