Thanks Desa Casley for asking the question!

The fact if you will bag a seat in the IISERs will depend on the list of preferences you have set and the marks secured in the IAT 2020(through SCB stream)

Please note that there are no official cutoffs. The IISER IAT does not have functions like JEE Mains/Advanced with X rank giving Y IISER for sure, as there are no opening or closing ranks/marks.

But considering the previous trends..the safe marks for the OBC stream would be 75/180 to bag the seats in the newest IISERs (i.e IISER Tirupati and Berhampur)

It is difficult but considering the fact this year seats are more through SCB stream , if you wait till the last round you may get an IISER . Hope for the best.