If you wish to take admission in the course of MCA in India, then you need to complete a UG degree program in any stream with Mathematics as one of the subject or BCA course, in order to be eligible for the course of MCA.

So without having a UG degree you can't take admission in the course of MCA. If you have passed class 12th or its equivalent in any stream, then you can take admission in the course of BCA.

For more information regarding BCA consider the link below:

https://www.careers360.com/courses/bca-bachelor-of-computer-applications

For more information regarding MCA consider the link below:

https://www.careers360.com/courses/mca-master-of-computer-applications

I hope this helps. Wish you a great day!