Hi,
The eligibility criteria to get MCA in Jadavpur University are:

60% in Hons. Subject
60% in Mathematics (general subject)
60% in Class XII examination
60% in Mathematics in Class XII
60% in Class X examination
60% in Mathematics in Class X

The selection will be tough-
You should have 60% marks in your graduation also,with a BCA or science degree, according to past year trends rank in between 1 to 100 in JECA is something that can put you at some chances to get Jadavpur University.