Commerce

There are American Institutes that conduct Group Fitness Training. In India we have a few of them. Try the following links:
http://www.fitindia.co.in/
http://www.trifocusfitnessacademy.in
https://classicfitnessgroup.com
http://goldsgym.in
http://www.gffi-fitness.org/
http://www.fitindia.co.in/

There is not any specific stream to select for hotel management as anyone from any field or stream can do hotel management.

Yes, as this is not a pure science subject only nomenclature is Bachelor of science however you should also check your interest aptitude and creativity before applying for the course as success is totally depend on how creative you are and your artistic aptitude.

No Rahul, you cannot pursue nursing or any medical related field after completing commerce. If you are not interested in commerce you should check other areas of your interests that could be closely related to commerce, perhaps you can check travel, tourism, event management, interior design etc.

Hi Ayush,
A minimum of 70 to 75% is required and IELTS score of 6 is recommended. You should also check the university websites since different universities have different admission requirements.

In my opinion, you should pursue with UG, PG and P.hD or should qualify NET to become a teacher. In this sense, you should take admission in B.Com right after 12th in a reputed university.