You can go for BCA. It is one of the best options after 12. Any candidate who has cleared 10+2 from any discipline with maths are eligible for this course. You have to get minimum 50% in 12th.
Chartered Accountancy or CA is a course Commerce students can pursue to become Chartered Accountants.
Company Secretary or CS is a course Commerce students can pursue after Class 12 to become Company Secretary.
There are also many courses BBS, BHM, law courses, BBA, BFA etc.