Hello Swagatika,

Your chances of getting in any IISER is a bit less . Scoring around 95 and above will keep anyone in safe side. However take a note that-Nothing is defined or determined,Paper patterns change every year,Number of takers change every year,Relative toughness changes every year,Relative smartness of students increase so papers are more easily solved every year,Most IMPORTANTLY Questions change every year. These Factors play a very important role in determining the cut offs.

Hope this helps!

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All the Best!!