Actually, the IISER do not post the cutoff or some sort of merit list. They just tell that whether you are in or out so it is difficult to tell the cutoff.

However, with this score, you have a good chance of getting in the IISER. Still, you have to wait till the last round as the cutoff for the IISERs is close to 70.

For more information about the IAT, its seats and cutoffs, you can go for the below link:

https://engineering.careers360.com/articles/iiser-merit-list-and-cutoff

Bet of luck!