Diploma

You can consider following colleges:
1. Asian Academy of Film and Television
2. Garden City University, Bangalore
3. Tuli College of Hotel Management, Nagpur
4. Lovely Professional University
5. Wing’s Aviation and Hospitality

Hello Chandrakant,
It's indeed very heartening to know that you are interested in enhancing your skills by pursuing diploma in mechanical engineering. Yes, it's possible and there are many institutes offering the same. I am attaching a link that will give you all the required information.
https://www.

Your rank should be around 160 for admission in Government Polytechnic Bandra.

Yes, they can join BMS College for doing part-time B.Tech in ECE.

To pursue DPM (Diploma in Psychological Medicine), which is a PG degree, you have pursue MBBS.

Agrawal Institute of Management and Technology - AIMT
Banaras Hindu University - BHU
Brilliant Education
Candor Institute of Distance Education
Culinary Institute of India (CII) and Centre for Information Technology and Management Sciences
Dayalbagh Educational Institute
Delhi Degree College - DDC
Delhi De

Yes. You can definitely join Marine Engineering through both regular entry and lateral entry. You are eligible for engineering related to your field in Diploma.

If you are a Diploma holder with atleast 10 years of experience, then I would suggest pursuing MBA through distance from UPES. It should give your career a serious boost.

Yes. You can certainly apply for this course. Your Academic Gap and job will not affect your admission here.