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

IISER IAT 2027 eligibility requires students to have passed Class 12 with Physics, Chemistry, and Mathematics, securing at least 60% aggregate marks (55% for SC/ST/PwD). There is no upper age limit for IISER IAT 2027.

IISER IAT (Integrated Aptitude Test) is conducted by the seven Indian Institutes of Science Education and Research for admission to the 5-year BS-MS dual degree program. For IAT 2027, students applying through the State/Central Board (SCB) channel must meet specific academic and year-of-passing conditions to be eligible to sit for the test.

• Students must have passed or be appearing in Class 12 in 2027, or must have passed Class 12 in 2026.
• Minimum 60% aggregate marks in Physics, Chemistry, and Mathematics at Class 12 level are required for General and OBC-NCL category students.
• SC/ST/PwD students need 55% aggregate in PCM subjects at Class 12.
• There is no upper age limit for IISER IAT 2027.
• Students get a maximum of 2 attempts at IISER IAT — once in the year of passing Class 12 and once the following year.
• Nationality must be Indian or Overseas Citizen of India (OCI).

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IISER IAT 2027 Eligibility Overview

IISER IAT 2027 is the entrance test for students applying to the IISERs through the State/Central Board (SCB) channel. The table below summarises all key eligibility conditions at a glance before you go through each criterion in detail.

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Class 12 Marks and Subject Requirements

Students applying for IISER IAT 2027 must have Physics, Chemistry, and Mathematics as core subjects in Class 12 and must secure a minimum aggregate in these three subjects. The marks threshold differs by category.

The aggregate is calculated across the three science subjects only — Physics, Chemistry, and Mathematics. You must also pass each subject individually. A high combined average does not compensate for failing one subject. For biological sciences programs offered at certain IISERs, Physics, Chemistry, and Biology may be accepted in place of PCM — check the official prospectus of the specific IISER before applying.

Students who are appearing in Class 12 in 2027 (i.e., have not yet received their final result) are also eligible to register for IAT 2027 provisionally, subject to meeting the marks requirement at the time of admission.

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Age Limit for IISER IAT 2027

There is no upper age limit for IISER IAT 2027. Any student who meets the Class 12 qualification criteria and the year-of-passing condition can apply regardless of age. There is also no lower age limit specified in the IISER admission guidelines.

This is a key difference from several other national entrance exams that cap the age of applicants. The absence of an age restriction means that students who took a gap year or had to repeat Class 12 are not automatically disqualified on the grounds of age alone. However, the year-of-passing restriction still applies — only students from the Class of 2026 and Class of 2027 are eligible for IAT 2027, regardless of their age.

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Number of Attempts for IISER IAT 2027

Students can attempt IISER IAT a maximum of 2 times in total. The two-attempt window is directly tied to the year of Class 12 — you get one attempt in the year you pass Class 12 and one attempt in the year immediately after.

• Attempt 1: Students appearing in or passing Class 12 in 2027 can sit for IAT 2027 as their first attempt.
• Attempt 2: Students who passed Class 12 in 2026 can appear in IAT 2027 as their second and final attempt.

Students who passed Class 12 in 2025 or earlier are not eligible for IISER IAT 2027 under the SCB channel. The two-attempt system does not allow a third or later-year attempt under any circumstances through this channel.

Students qualifying through the JEE Advanced or INSPIRE SHE Scholarship channels have separate attempt rules governed by those respective programs and are not restricted by the IAT two-attempt cap.

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Category-wise Eligibility Relaxation

IISER IAT 2027 follows Government of India reservation norms. The marks relaxation applies to the Class 12 qualifying criteria — it does not affect the IAT cutoff scores used in merit ranking. Seats are distributed as per the central government reservation policy.

OBC-NCL students must note that the marks relaxation does not apply to them. They must secure 60% aggregate in PCM — the same threshold as the General category — even though reserved seats are available for them in the final merit list.

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Admission Channels and IAT Eligibility

IISER offers BS-MS admissions through three official channels for the 2027 cycle. IAT is one of these three. If you qualify through another channel, you do not need to appear in IAT.

For the SCB/IAT channel, your final merit is calculated using both the IAT score and your Class 12 board percentage — it is not based on the IAT score alone. Students who have already secured a JEE Advanced 2027 rank that meets the IISER cutoff do not need to take IAT. You should choose the channel that gives you the strongest position in the merit list.