Hello Sabir, 

MCA is Master of Computer Application. It is a technical side of computer science. If you are really interested in computer programming, ios, android development, big data etc., but you need to have background knowledge of Computer architecture atleast. Otherwise it will be difficult to understand technical terms in CS. 

For admission in this course you need to complete your graduation from a recognized university as a compulsory maths subject in 12th exams. But it varies from college to college. Also you need to pass with 50% aggregate marks in Bachelor's degree. 

The below given link would help you further:

https://it.careers360.com/articles/5355-7-MCA-entrance-exams

All the best!!! 

Hello Sabir,
Yes, you may pursue in MCA after B.Com. There is no restriction and you may not face any hinderance as well. The candidate who are applying for MCA must be under elligibility. The elligibility scenario is as under:-

• Minimum marks required: 50% to 60% (a CGPA above 6/10 is considered good) in Bachelor's; 55% and above in Class 12th. Class 10th marks do not matter in most cases.
• You must have done Mathematics in 12th standard.

Thank you.