NMIMS School of Business Management, Mumbai

UBS is the 1st B-School in India to give a PGDM with foreign collaboration in partnership with Cardiff Met. University, UK which is a 150 years old British University ranked no1 modern university in UK with 80000 alumni. UBS ROI is higher than SPJIMR and NMIMS. UBS has been endorsed by 60 CEO. Their credibility is unmatched.
Link: https://www.facebook.com/universalbusinessschool/photos/a.193198834029917.56009.117734061576395/2011425888873860/?type=3&theater.

Firstly, you must be clear as to what you intend to do after MBA. It may not add value if you are looking at clinical practice. but if you aspire to be in managing hospitals, then it is better to do MBA. Many students with BDS take up MBA in Pharma & Healthcare Management. They acquire management skills & knowledge to pursue management jobs. Today, with Hospital sector growing rapidly, these career paths can take you to the top management positions over a period of time.

HI Dishant,
There is not a particular process of preparing yourself for GD-PI, but what you can do is start reading newspapers (regularly), try to get some insights from quora or other platforms (online). Also, you can join some coaching classes for GD -PI practices.

Yes, you may apply to NMIMS. Work experience is not mandatory for application purposes. NMIMS has a good mix of freshers and people with work experience.