In order to be eligible for NIMCET you need to score at least 60% marks or 6.5 CGPA score in aggregate of all subjects in  graduation degree i.e. BCA/B.Sc (Hons.)/B.Sc/ BIT as per 10+2+3 pattern from a recognised University. 

For SC/ST you should have 55% marks or 6.0 CGPA score on a 10 point scale in aggregate of all subjects.

Good Luck!!