To be eligible for IISER IAT 2027, you must have passed or be appearing in Class 12 with Physics, Chemistry, and Mathematics or Biology, scoring at least 60% in qualifying subjects (55% for SC/ST/OBC-NCL/PwD students).
IISER IAT (Indian Institutes of Science Education and Research Aptitude Test) is conducted annually for admission to the BS-MS dual degree program at the seven IISERs. The Joint Admission Committee (JAC) sets uniform eligibility rules across all IISERs. Knowing these criteria in advance helps you confirm your eligibility before the application window opens.
- Subject requirement: Physics and Chemistry are mandatory; you also need Mathematics or Biology (or both) as a third qualifying subject.
- Minimum marks: 60% aggregate in qualifying subjects for General/EWS; 55% for SC/ST/OBC-NCL/PwD.
- Year of passing: You must have passed Class 12 in 2026 or be appearing in 2027.
- Attempts: Effectively one attempt per student — students who passed Class 12 in 2025 or earlier are not eligible for IAT 2027.
- Age limit: No upper age limit is prescribed for IISER IAT 2027.
| Direct Link to IISER IAT 2027 Official Admission Portal |
IISER IAT 2027 Eligibility Overview
IISER IAT 2027 is open to students completing or having completed Class 12 from any recognized central or state board. The exam is the direct route to BS-MS programs at IISERs in Berhampur, Bhopal, Kolkata, Mohali, Pune, Thiruvananthapuram, and Tirupati. The eligibility conditions apply uniformly across all campuses.
| Parameter | Requirement |
|---|---|
| Qualifying Exam | Class 12 or equivalent from a recognized board |
| Compulsory Subjects | Physics and Chemistry |
| Third Subject | Mathematics or Biology (or both) |
| Minimum Marks — General/EWS | 60% aggregate in qualifying subjects |
| Minimum Marks — SC/ST/OBC-NCL/PwD | 55% aggregate in qualifying subjects |
| Year of Passing | Passed in 2026 or appearing in 2027 |
| Age Limit | No upper age limit |
| Attempts per Year | One; only 2026 pass-outs and 2027 appearing students eligible |
Subject Requirements: PCM, PCB or PCMB
IISER IAT tests your aptitude across Biology, Chemistry, Mathematics, and Physics. Your Class 12 subjects must cover at least three of these. Physics and Chemistry are compulsory for all students, and you must additionally have studied Mathematics or Biology (or both) in Class 12.
- PCM students (Physics, Chemistry, Mathematics): Fully eligible. You will attempt all sections of the IAT paper.
- PCB students (Physics, Chemistry, Biology): Fully eligible. You may attempt the Biology section and qualify for biology-stream BS-MS seats at IISERs.
- PCMB students (Physics, Chemistry, Mathematics, Biology): Eligible for all seat categories and have maximum flexibility in the exam.
Students with only Physics and Chemistry and no Mathematics or Biology in Class 12 are not eligible for IISER IAT 2027.
Minimum Marks Requirement
You need at least 60% aggregate in your qualifying subjects (Physics, Chemistry, and Mathematics or Biology) to be eligible for IISER IAT 2027. This percentage is calculated on Science stream subjects, not the overall Class 12 aggregate including languages or optional subjects.
If your board uses a grade-point system, the equivalent grade for 60% is accepted. Students whose Class 12 result is pending at the time of application may apply provisionally and must meet the 60% bar once results are declared.
| Category | Minimum Marks in Qualifying Subjects |
|---|---|
| General / EWS | 60% |
| OBC-NCL | 55% |
| SC / ST | 55% |
| PwD (any category) | 55% |
Number of Attempts and Year of Passing
IISER IAT 2027 permits only one attempt per academic cycle, and your eligibility window is strictly limited to one year. You can appear in IAT 2027 only if you belong to one of the following groups:
- Students who passed Class 12 in 2026 are eligible for IISER IAT 2027.
- Students appearing in Class 12 in 2027 are eligible for IISER IAT 2027.
- Students who passed Class 12 in 2025 or earlier are not eligible for IISER IAT 2027, regardless of prior attempts.
This one-year window means IISER IAT is effectively a single-attempt opportunity for most students. Unlike JEE Main, there is no multi-year attempt provision. If you passed Class 12 in 2026, IAT 2027 is your last chance to appear through this route. Plan your preparation well ahead of the application date.
Age Limit
IISER IAT 2027 does not prescribe any upper or lower age limit. You are eligible to sit the exam irrespective of your age, as long as you satisfy the Class 12 qualification and year-of-passing conditions. Age-based restrictions seen in some other national entrance exams (such as the 17-year minimum for NEET UG) do not apply to IISER IAT.
Category-wise Relaxation
The JAC provides a 5-percentage-point relaxation in the minimum Class 12 marks for students from reserved categories. This relaxation applies only to the eligibility threshold, not to seat allotment or rank calculation.
| Category | Marks Relaxation | Minimum Required |
|---|---|---|
| General / EWS | None | 60% |
| OBC-NCL | 5 percentage points | 55% |
| SC | 5 percentage points | 55% |
| ST | 5 percentage points | 55% |
| PwD (any category) | 5 percentage points | 55% |
OBC-NCL status is determined as per the central government list. A state-level OBC certificate alone may not be accepted. Refer to the official IISER IAT 2027 information brochure for the exact certificate format and documentation required.
Eligibility Checklist Before Applying
Go through this checklist before filling the IISER IAT 2027 application form to confirm you meet all conditions:
- You passed Class 12 in 2026 or are appearing in 2027.
- Your Class 12 subjects include Physics and Chemistry plus at least one of Mathematics or Biology.
- Your aggregate in qualifying subjects is 60% or above (or 55% if you are SC/ST/OBC-NCL/PwD).
- You have not passed Class 12 in 2025 or earlier.
- Your board is recognized by a central or state authority (AIU equivalence accepted for foreign boards).
If you satisfy all five points, you are eligible to register for IISER IAT 2027. Students with a pending result may apply provisionally and submit their final marksheet once it is declared.
IISER IAT 2027 Eligibility Criteria FAQs
Ques. Is there an age limit for IISER IAT 2027?
Ans. No, IISER IAT 2027 does not have any upper or lower age limit. You only need to meet the Class 12 qualification and year-of-passing requirements.
Ques. Can PCB students appear for IISER IAT 2027?
Ans. Yes, PCB students are fully eligible for IISER IAT 2027. Physics, Chemistry, and Biology satisfy the subject combination requirement. PCB students can attempt the Biology sections of the aptitude test and qualify for biology-stream BS-MS seats.
Ques. How many attempts are allowed for IISER IAT?
Ans. IISER IAT allows one attempt per year. Crucially, you are eligible only in the year you are appearing in Class 12 or the year immediately after passing. Students who passed Class 12 in 2025 cannot appear in IISER IAT 2027, making it effectively a one-time opportunity per student.
Ques. What is the minimum percentage required for IISER IAT 2027?
Ans. You need at least 60% marks in Physics, Chemistry, and your third qualifying subject (Mathematics or Biology) for the General and EWS categories. SC, ST, OBC-NCL, and PwD students need a minimum of 55%.
Ques. Can a student who passed Class 12 in 2025 apply for IISER IAT 2027?
Ans. No. IISER IAT 2027 is open only to students who passed Class 12 in 2026 or are appearing in 2027. Students who passed in 2025 or earlier are not eligible.
Ques. Is it compulsory to have all four subjects (PCMB) for IISER IAT 2027?
Ans. No, PCMB is not compulsory. PCM or PCB alone satisfies the subject requirement. PCMB students have added flexibility as they can attempt all four sections of the paper, but PCM and PCB students are equally eligible to apply.
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