Hello,
Candidates can get admission through JEE Advanced in IISER.Candidates rank must be in top 10,000 to be eligible to get admission.So you need to appear in JEE main qualify in it and appear in JEE Advanced.
For other information you can click the link below
http://www.iiseradmission.in/index.php/pages/eligibility
Eligibility | Application | Exam Pattern | Admit Card | Result | Answer Key | Counselling | Accepting Colleges
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