Hello Shivani

You are eligible to join in MCA after  your B.Com with computer applications because the basic requirement is the person should have an undergraduate degree from a college and must have done maths in 12th standard if you didn't had maths in 12th then it won't be possible for you to join MCA and your computer application with B.Com (//B.Com) will help you in MCA as you must have some knowledge because of that about programming and everything

hope this helps you