IISER IAT 2027 Eligibility: Age Limit, Class 12 Marks and Attempts

IISER IAT 2027 eligibility requires a minimum of 60% aggregate marks in Class 12 for General and OBC-NCL students (55% for SC/ST/PwD), with Physics and Chemistry as compulsory subjects along with Mathematics or Biology.

IISER IAT (Indian Institutes of Science Education and Research Aptitude Test) is the national-level entrance exam for admission to the 5-year BS-MS Dual Degree programme at seven IISERs — Bhopal, Kolkata, Mohali, Pune, Thiruvananthapuram, Tirupati, and Berhampur. The 2027 eligibility norms are expected to follow those of 2026. Students who passed Class 12 in 2026 or are appearing in 2027 will be eligible to apply. The official IISER IAT 2027 notification with confirmed eligibility criteria is expected to be released in early 2027.

• Minimum 60% aggregate marks in Class 12 for General and OBC-NCL students.
• Minimum 55% aggregate marks in Class 12 for SC, ST, and PwD students.
• Compulsory Class 12 subjects: Physics and Chemistry, plus Mathematics or Biology (or both).
• Eligible passing year: 2026 (already passed) or 2027 (appearing).
• No age limit for IISER IAT as per previous year norms.
• Students who passed in 2026 can attempt IAT a maximum of 2 times (in 2026 and 2027).

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IISER IAT 2027 Eligibility Criteria Overview

IISERs offer a rigorous 5-year BS-MS Dual Degree in sciences including Biology, Chemistry, Mathematics, Physics, and Earth and Environmental Sciences. Admission through the IAT channel is for students who clear the IISER Aptitude Test. The table below summarises the expected eligibility parameters for IISER IAT 2027 based on 2026 norms.

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Qualifying Examination Requirements

To apply for IISER IAT 2027, you must have completed or be currently appearing in Class 12 (10+2) or an equivalent exam from a recognised central or state board. Students who passed Class 12 in 2026 or are appearing in 2027 are eligible for IISER IAT 2027.

Students who have passed Class 12 from international boards such as IB or Cambridge IGCSE may also be eligible if their qualification is deemed equivalent to Indian Class 12. Such students should verify their eligibility directly from the official IISER admissions portal. If you are appearing in Class 12 in 2027 and are provisionally selected, you must produce your final marksheet at the time of document verification and must meet the minimum percentage requirement.

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IISER IAT 2027 Minimum Percentage in Class 12

The minimum aggregate percentage required in Class 12 for IISER IAT 2027 is 60% for General and OBC-NCL students, and 55% for SC/ST and PwD students, based on 2026 eligibility norms. The aggregate percentage is calculated across all subjects studied in Class 12 as per the respective board’s norms. For boards that award grades, you must convert grades to percentage using the official conversion formula of your board.

Students appearing in Class 12 in 2027 can apply provisionally, but final admission is conditional on achieving the minimum aggregate percentage in their board result.

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IISER IAT 2027 Age Limit

There is no upper age limit for IISER IAT 2027 as per previous year eligibility norms. Unlike JEE Main or NEET UG, IISER does not impose any age bar on students applying through the IAT channel. Any student who meets the Class 12 qualification and subject requirements can apply regardless of age.

This makes IISER IAT accessible to students who may have taken a gap year or repeated Class 12, as long as they fall within the eligible year-of-passing window. Students should confirm this in the official 2027 notification once released.

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IISER IAT 2027 Number of Attempts

Students can attempt IISER IAT in a maximum of two consecutive years. This follows from the year-of-passing eligibility window: only students who passed Class 12 in the current or immediately preceding year are eligible each time IAT is conducted.

A student who passed Class 12 in 2026 is eligible for IAT 2026 (first attempt) and IAT 2027 (second attempt). A student appearing in Class 12 in 2027 is eligible for IAT 2027 (first attempt) and IAT 2028 (second attempt).

Students who passed Class 12 in 2025 or earlier are not eligible for IISER IAT 2027. The two-year eligibility window is strictly enforced based on previous year patterns.

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IISER IAT 2027 Subject Requirements

Physics and Chemistry are compulsory subjects in Class 12 for IISER IAT 2027 eligibility. In addition, you must have studied at least one of Mathematics or Biology. Both PCM and PCB students are eligible to apply for IAT 2027.

IISER programmes span Biology, Chemistry, Mathematics, Physics, Earth and Environmental Sciences, and Economic Sciences (at select IISERs). Your subject choice in Class 12 does not restrict which IISER programme you can apply for — all eligible students sit the same IAT paper regardless of whether they studied Maths or Biology in Class 12.