MCA or Master of Computer Application is a post graduate degree of 3yrs which can be pursued after graduation in any subject as long as you’ve had Mathematics as a subject during 10+2 or during graduation. It is a good choice if you want to go for a software job as it is an industry intensive course which prepares you for the IT industry. You can also pursue a teaching job after this degree as it prepares you well with the basic subjects of CSE. Since your B.Sc degree has already prepared your research acumen, thus this degree will be easier to pursue as it less intensive in terms of research and thus will allow you to improve other areas. A lot of colleges all around the country offer this degree and you can check them out according to your preference of city/fees/etc.
Hope this helped!