Dear student,
Its really good to see you are interested in BCA.
one of the main eligibilty criteria is to have passed 12th with minimum 50%. The next important thing is that you have studied maths as a compulsory subject in class 12th. Some colleges have entrance will some have admission on merit basis.
Coming to the scope; You have a very wide scope these days in BCA. You can work for an MNC or wok for yourself. You can become a developer, Programmer, coder, web designer.
All the best. I hope this was helpful to you.