Hey Deependra,

BCA is a three year full time course  and MCA is for two years. Anyone who is interested in computers can pot for this.
The BCA-MCA is  a 5 year integrated course aims at incultating essential skills as demanded by the global software industry. It is desingned to build programming skills for developing highly efficient software, website, mobile application and ample of things regarding Computer.
Jobs:-
System Analyst,System Designer, IT manager, mobile applications, and no. of jobs.
Eligibility:-
10+2 with atleast five subjects from any recognized board/University.

If you're interested in computers and its applications you can opt this course. No matter what how much you scored in 12.