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!!!
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