Hello Rahul,

Sorry to say but you need to score atleast 90+ in IAT to get a seat in one of the IISERs. The top IISERs like IISER Kolkata, IISER Pune require a higher mark like 120+. Since students get admission into IISERs through various channels like KVPY score,JEE Advances,JEE Main,SCB score, scoring 71 won't fetch you any branch in any of the IISERs.

Hope this helps!

Stay connected for further queries.

All the Best!!