M.Tech

Hello,
Yes, you can do M.Tech after completing B.Sc. But, you have to clear entrance exam to get into a college for M.Tech.
You can try to get admission in:
1. IIT's
2. NIT's
3. IISc – Bangalore.
4. Birla Institute of Technology - BIT Mishra.
5. Anna University.
You can also prepare for IIT JAM entrance tes

Check Washington University in St. Louis, Columbia University, Pennsylvania State dual degree programme, Georgia Tech University dual degree program, Queen's University and The University of Western Ontario. There are many more, USA has many options.

Yes, you can do it, kindly go through the university's website.

You can check the below mentioned link:
https://engineering.shiksha.com/me-mtech-in-kerala-categorypage-2-59-1-0-0-1-107-2-0-none-1-0

It's better to prepare for GATE and secure a seat for M.Tech rather than joining a college which will give you degree but that will be of no use.

Most of the colleges accept GATE score for M.Tech.

You need to clear GATE to get into IIT for M.Tech course.

Marine engineering course is good for you because of your mechanical engineering and it will help to make your career, so you can pursue GME course.

If you have done MCA through distance learning from a recognized university, then you are eligible to appear for GATE to get admission in M.Tech CSE.