Dear Dipak

As you have stated that you score in IAT is 75(SCB) in general category.  As per the last year cutoff, it was 72/200 to get into IISER , so yes you may have chance. But please remember that this is last year cutoff and it changes every year so it might increase this year too. But still you might have a chance. So go for the seat allocation and wait for the counselling.  Good luck