Hope you are doing great. As per your query I would like to inform you that if you have completed your class XII from any of the recognized board from any stream (Arts, Commerce or Science) you are eligible for taking admission in Bachelors of Business Administration - BBA. Different universities have different entrance exams for BBA. If you wish to take admission in Delhi University - DU you need to appear for Delhi University Joint Admission Test - DUJAT.
Hope it helps!!