Is it possible to pursue Masters in computer science from abroad after completing 3 years BCA degree?

Hi The criteria suggested by others is correct but you do hv the option of studying immediately after bca with few universities. Check your eligibility here: http://www.msinus.com/content/profile-evaluation-ms-us-261/

Yes, you can pursue master degree from USA after completing your 3 years of graduation but not many universities of the USA considered the 15 years of education.

yes you can do in UK. you can do MSC in some specialised computer field. because if the specialisation you become more employable than generic master in computer science

In majority of universities abroadMS in Computer Science is offered to students who have completed 16 years of school education +2 & then +4. You may not get admission in MS CS abroad after BCA.