B.Com

Good to hear your consistent good performance in 10th and 12th. Congrats. You have to get more than 80 percentile in CMAT for our college (Thiagarajar School of Management).

You can go for specialized M.Com, Masters in economics, LLB, CFA or you can go for certificate courses like tax return preparer, certified financial planner, certified credit rating analyst, stock market courses, banking Diploma or banking exams like IBPS.

It depends upon the type of college you are taking admission into. If you are taking admission in grade A or grade B-schools then doing a job / internship would be good. If you wish to do part time MBA then job is mandatory.

Congratulations for your score and such good profile.
KIAMS has finance as an option for PGDM, but marketing is more prevalent in KIAMS.
Companies generally come for marketing profile though finance companies do come.
But you can go on for better college as your score and experience is good.
Another opt

B.Com along with dance training is a good idea as just in case you ever wish to change the field you'll have the option as a backup.

You should learn Advanced excel course or opt for Tally certification course if you want to get a good job in the accounting field.

You can pursue CFA, CS or M.Com. LLB is a lucrative option even MBA graduates are rushing to do LLB.
You can also pursue courses such as CFP, CCRA, etc.

B.Com students usually pursue M.Com, MBA or CFA, but you can opt for MCA. For a B.Com graduate, the duration of MCA is 3 years.