Let’s consider the eligibility criteria of both programs individually
BMS
- Candidates who have passed Class 12 from a recognized board with at least 60%
- Candidates must have studied Mathematics subject
BBM
- Candidates must have completed 10+2 or equivalent
- Entrance exams are also a part of the eligibility criteria for example IPU CET, NPAT, AIMA UGAT, SET, etc.
So, only BMS seems to require Math for admission and you can get admission to BBM at DU without Math.