B.Com

For re admission u need to again start your course by giving entrance.

Dear student, please go through this website for more information related to your query this will help you
https://www.shiksha.com/university/panjab-university-puchd-Chandigarh-4026/admission.

If you are in and around Chennai I would suggest you LOYOLA COLLEGE. Reason being
-The brand name associated
-Quality of education and ratings
-And the placements.

In Mithibai college, entrance are done on the basis of merits of the student. So, your 12th marks will be helpful for you in getting admission in it.

For cutoff, you can visit the below link-
https://www.shiksha.com/college/goenka-college-of-commerce-and-business-administration-b-b-ganguly-street-kolkata-13132/admission

It will help you to get into CA course.

You need to take 10th and 12th's TC, CC and Migration.

It depends on which college you are pursuing your Bachelors in Commerce and what will be the placement in future depends upon the internship and the hard work you did in 3 years of your course.

If you compare BBA and B.Com (Hons), BBA would be best if you are planning to do business or anything related to that in the upcoming time, B.Com (Hons) is nothing different from B.Com with, just few subjects being different.