If you are going to clear Class 12 and wish to join Aligarh Muslim University (AMU) for BBA or BCom, you need to appear for the AMU Entrance Test (CUET-UG optional for some courses).

Pass 12th with at least 50% marks in any stream. Based on AMU Entrance Test rank (or CUET score if accepted that year).
Start preparing early — AMU’s BBA and BCom cutoffs are usually high due to competition.