Hello, Yes you are eligible as minimum aggregate for 10+2 is 55%. to take an admission you have to get a rank above than 1000 as the seats available are in 1200 odd numbers.
It will be difficult enough for sure but you have to do it.
to know the full information about the eligibilty criteria please go through the link below:-
https://engineering.careers360.com/articles/iiser-eligibility-criteria
All the best!
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