MCA

Not at all. You just need a good score in BCA and school level and reasoning skills and imagination.

Yes, of course, you can do regular MBA or MCA after completing your graduation from open university. Just check entrance exam that you have to appear for. Entrance exam changes from college to college. Hope this helps you. Be free to share any problem you have.
GOOD LUCK.

Yes, you will get the admission. At IGNOU it's easy to take admission as it is an open university. You must be having a graduate degree also. Go ahead.

For MCA you need to have good knowledge of coding because it is a Masters degree and there is no coding in B.Sc mathematics.

Hi,
Candidate must have completed graduation/masters securing at least 50% aggregate marks (45% for SC/ST/OBC).
Yes, you can apply.

The MCA fee for all year is 60000.

Check out the details below for KIIT entrance exam for MCA:
In general, KIITEE is conducted for admission to B.Tech. (4years) / B.Tech & M.Tech Dual Degree (5 years) / B.Tech &MBA Dual Degree (5 years) / B.Arch /MBBS/BDS / B.Sc. Nursing /Biotechnology Dual Degree (B.Tech / M.Tech) courses of study al

Yes, absolutely. Only the condition is, the degree of your Masters must be from recognized university through NACC and UGC.