Air Hostess and Steward Training

Not sure about the Academy you enquired about but usually the fees for such Diploma courses range between INR 35,000 - 60,000.
You can expect the fee to lie in this range.

First, choose your course, then you will find relevant colleges throughout this link please visit the link below:
https://www.shiksha.com/aviation/colleges/colleges-india-8.

Yes, you can do the cabin crew Training.
In general, Candidate Profile for Freshers for cabin crew is as under:
Age: Between 18 and 27 years
Minimum Height: Men - 170 cms and Women - 157 cms
Weight:In proportion to height
Educational Qualification: HSC (10 + 2). Candidates who are appearing for their H

For Cabin Crew Training:
1. Flying Queen Air hostess Academy, New Delhi
2. Wings Air Hostess and Hospitality Training, Vadodara, Gujarat
3. TMI Academy of Travel Tourism and Aviation Studies, Mumbai
4. Air Hostess Academy, Bangalore, Karnataka
5. Universal Aviation Academy, Chennai, Tamil Nadu
General

Hi Sachin, The best institutes for cabin crew are Frankfinn, Bombay Flying Club, Jet Airways Training, Compass Aviation, PCT Aviation and HM Aviation. These are some of the best institutes, but Frankfinn is the best option
Regards.

Cabin Crew is one of the good career option as it offers good career prospects and excellent growth opportunities not only in India but across the globe
Eligibility:
-Physical requirements - Height for Air Hostesses - minimum of 157.5 cm and Flight Pursers 163 cm with proportionate weight. -Graduates

Some popular Air Hostess Training Academies in India are:
1. Flying Queen Air hostess Academy New Delhi
2. Wings Air Hostess and Hospitality Training Vadodara Gujarat
3. TMI Academy of Travel Tourism and Aviation Studies, Mumbai
4. Air Hostess Academy, Bangalore, Karnataka
5. Universal Aviation Acade

Please elaborate more about what job role exactly you are looking for in the aviation industry, so that I can help you better.

B.Com. is a graduation degree course, and Cabin Crew course is a professional training. It will not add to your education, but it will help you get trained for a particular job role.
Hence there is no harm in doing both simultaneously.
For your convenience, I've listed below the general guidelines a

They disclose the fee only after you submit a query for admission to them.
So please contact them:
TMI Academy - Kolkata
Chatterjee International Centre,
6th Floor, 33 A, J. L. Nehru Road, Near Park Street Metro Stn, Chowringhee, Kolkata (71)
Or fill the form at http://www.tmiacademy.com/contact.html