Hello dear,

there is no fixed cut-off for IISER aptitude test but if you go with last year cut-off then i think that around 60 to 80 is best and good enough for getting admission in bsc physics at IISER.if you want to go for it then it is good because there is no competetion because only 10,000 to 15,000 students are giving IISER aptitude test.

All The Best.