You must check your knowledge in mathematics before going for MCA , as it's not easy to crack entrance as well as MCA
It all depends on university to colleges whether they allow it most of good university are not allowing if you don't HV maths in 12th

In North India you can find most of colleges which are giving admission to non maths students  but in South they are very less university which are giving admission without mathematics subject.

You can try once in which state you belong and the university and check from them if they allow it..