SIITAM - Sun International Institute of Tourism and Management, Hyderabad

https://www.shiksha.com/hospitality-travel/hotel-hospitality-management/ranking/top-hotel-management-colleges-in-india/98-2-0-0-0
These are the top colleges for the course you desire.

Yes, you can surely enroll yourself for MBA in Hotel Management and Tourism. Candidate completed graduation from any recognized college/university are eligible to apply. Interested candidates can apply with the required information. Admission is based on the marks obtained in graduation.
You can work as:
1. Hotel Manager
2. Assistant Manager
3. Catering Department
4. Executive Chef

Hi Leela,
Yes, you can surely enrol yourself for MBA in Hotel Management and Tourism. Candidate completed graduation from any recognized college/university are eligible to apply. Interested candidates can apply with the required information. Admission is based on the marks obtained in graduation.
You can work as:
1. Hotel Manager
2. Assistant Manager
3. Catering Department
4. Executive Chef

Your brother is eligible for Diploma course in Hotel Management and job opportunities are good for HM.
Regards,
Siitam.

After completing B.Tech, I don't think Diploma in hotel management will be good idea. Now, the fees varies from college to college.

The fee structure for Bachelors in Hotel Management is 2.8 lakh rupees with (4 equal instalments) an international tour (free).

of course, you can join as you have completed your graduation.