hello

There is no cutoff such thing to get admission in IISER because they do not releases their cutoffs. But for idea if you belongs to general category and if you score above 100 then you will definitely get IISER.Also you have to clear cutoff of 10 +2 board exam marks(in your case  kerela which has 93.1%).

total marks in scb test is 180. Per subject there will be 15 questions, in total there will be 60 questions

hope it will help you

all the best!!