Can I do BCA after 12th commerce without computer science or maths through Mumbai University affiliated college?

Yes, you are eligible for BCA, as in BCA you only have to develop computer applications that only needs coding.

To study BCA, one should pass 10(+2) with maths, physics, and chemistry as main subjects. And he/she should get at least 50% marks in class 12th. Most of the colleges need either maths or computer as one of the subjects in 12th and also English as a compulsory subject. You are a commerce student, so