Dear Sonu

With your son marks being 78 out of 180 , his chances of getting into Indian Institute of Science Education and Research is way too low. The minimum cut off to get into IISER is 90 which is in the worst case scenario.  To get any good IISER you have get Mark's above 100 so yes 78 Mark's dont cut to get admission.  I would suggest some private colleges or universities.  I hope it helped