Hello student as per eligibility criteria candidates need to be graduate in any discipline there's no minimum marks requirement, barring a few exceptions like DIRUBAGH University.

College like IGNOU and ISI, Kolkata also demand mathematics as one of the subjects in their graduation.

For more details refer to the link mentioned below - https://www.google.com/amp/s/www.careers360.com/courses/pgdca-post-graduate-diploma-in-computer-application/amp

Feel free to comment if you have any doubt

Good luck