hello aspirant,
yes you are eligible for the counselling in IISER through your examinations. You can defintely give the entrance exam but the only rquirement is to have 75%(genral, obc, obc-ncl) in your 12th board and 65%(sc, st, pwd).
You can visit the official website of IISER to know in detail
http://www.iiseradmission.in/index.php/pages/eligibility
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