Hi Ashish,
IISER cut off depends on your board.
The format of the aptitude test is as follows:
1. Multiple-choice questions in four subjects –- Biology, Chemistry, Mathematics and Physics with equal weightage.
2. 15 questions in each subject (total: 60)
3. Duration: 180 minutes
4. Evaluation: +3 (correct response), 0 (no response), -1 (wrong response)
For Further details,visit the link: https://engineering.careers360.com/articles/iiser-merit-list-and-cutoff
I hope it helps.
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