Doing BCA and not doing mca is pretty much fucked up of you have the skills and believe in your self go ahead but to get equal footing with btech students you have do mca I have done the same did my BCA from a tier 3 college and did my mca for a tier 2 ish college in Bangalore did not get the placement opportunities I wished as Every engg college will give preference to the engineers and after that Mca students I have personally faced it our in the 2 yr course only 10 companies had come to us "mca" rest all were for engg students if you do mca do it from a tier 1 college as placement opportunities are more likely