hi,

the basic eligibility for mca course is students need to have bachelors degree in any discipline, like arts, science or commerce, but must have studies mathematics as a subject in 10+2 course.

now for nits, which is the mst prestigious institute in india, eligibility criteria is slightly different, you need to have graduation in bsc or be/btech or bit and must have studies mathematics or statistics as a subject in graduation course.

hope it would help.