Hello Cyril,

Since the actual cutoffs are never declared by the IISERs', you can never know if you will get selected or not on the basis of marks, IISER just tells you if you're selected or not. However, according to other candidates personal experiences. For general category student, marks about 110/180 will be excellent to get into any IISER.

Hope that helps and feel free to ask if you have any more queries. Best of luck!