Business Management Studies

There are over 51 BBA colleges in Chennai. Please refer to the link provided below for a detailed list of these colleges. You should be able to navigate to the top colleges in this list using the filters on the web page.
Regards.
https://www.shiksha.com/bba/colleges/bba-colleges-tamil-nadu?uaf[]=location&ts=43430703&rf=filters&ct[]=64

Your PG marks will carry higher weightage than UG marks. But remember also that the universities consider many other factors also like your recommendation letters, statement of purpose, extra curricular activities and your GMAT score.

Hi Shivam,
If you want to pursue BBA in event management, NAEMD is the best institute for it. You will have to appear for an entrance test designed to check the candidate's personality traits, academics, goals and self-awareness level. The test will be followed by an interview which will determine your final selection. For more information, you can visit this webpage and download the brochure:
https://www.shiksha.com/bba/course/bba-in-event-management-and-pr-national-academy-of-event-management-and-development-mumbai-goregaon-west-94042

Which course do you want to kno0w about?

Everyone will tell you that their college is good and all, but to be more sure, what I would suggest is you should research about both the colleges.

10 popular MBA in Marketing colleges in India are mentioned at the link provided below. Please note that this list does not include Iims and other leading B-Schools that offer Post Graduate Programmes where the students choose their specialisation in the second year of study. This list includes programmes dedicated to MBA Marketing.
Regards.
https://www.shiksha.com/mba/articles/top-10-mba-marketing-colleges-in-india-blogId-6897

Both are good in their own aspects, it's you who have to decide which one is better for you on a long run. Choose the one you are more interested in, don't listen to others. Google about both of them, their pros as well as cons and then make your decision.

B.Sc in hospital management is the new course in regards to B.Sc in nursing. So, if you want something new in your career try new.
All the very best.