There are not a lot of data available from which it can be predicted more sophisticatedly. But I would say that a marks >110 will be great for UR category students.
You can visit the link provided to have more info regarding the examination:
https://engineering.careers360.com/articles/iiser-merit-list-and-cutoff#IISER-Cutoff-2021
I hope my answer helps. All the very best for your future endeavors!
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