Marine Engineering

Please use given link to get the list of colleges
https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.shiksha.com/b-tech/colleges/b-tech-in-marine-engineering-colleges-india&ved=2ahUKEwiuoeLt-73iAhUQSX0KHSL5DxIQFjADegQIAxAB&usg=AOvVaw16Sz7BSn76FVRfU1pS9P0d.

BE (Bachelor of Engineering) and B.Tech. (Bachelor of Technology) both are Professional Course of Four Years Duration offer by Engineering Colleges/ Universities. Name of the programme is decided by the University that's it. Value as same.

Yes, you can. Diploma is considered equal to 12th and you are eligible for B.Tech.

You can pursue B.Tech. (Marine Engineering) - Four Years Duration Course - from Indian Maritime University, Chennai. More Practicals and Placement will be good.

This is the address of the institute.
Talegaon - Chakan Road, Induri, Talegaon, Dhabhade, Pune, Maharashtra 410507

There is no cut off marks. For syllabus https://www.himtcollege.com/admission.

Yes, the question papers are different. You can check more details on IMU website. If you want please check the website. For your reference I'm putting here the mail id. www.imu.edu.in

No, there is no placement guarantee.
Good luck.

Yes, you can apply with this eye sight. You will be having no problem with this vision. Go ahead and take admission in this course. 6/9 is allowable.
Best of luck.