To qualify for IISER IAT 2027, you need a minimum of 60% aggregate marks in Class 12 (55% for SC/ST/PwD students) with Physics, Chemistry, and at least one of Mathematics or Biology as compulsory subjects.
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 all seven IISERs. The eligibility criteria cover your academic qualification, subject combination, Class 12 percentage, and the year you passed Class 12. There is no upper age limit for IISER IAT 2027.
- Minimum Class 12 percentage: 60% for General/OBC-NCL/EWS, 55% for SC/ST/PwD.
- Compulsory subjects: Physics, Chemistry, and Mathematics or Biology in Class 12.
- Year of passing: students who passed Class 12 in 2026 or are appearing in 2027 are eligible.
- No upper age limit is prescribed for IISER IAT 2027.
- There is no fixed attempt cap; eligibility is governed by the year-of-passing window set each year.
| Direct Link to IISER IAT 2027 Official Website |
IISER IAT 2027 Eligibility at a Glance
The table below summarises all key IISER IAT 2027 eligibility parameters. Check each criterion before you register.
| Eligibility Parameter | Requirement |
|---|---|
| Minimum Qualification | Class 10+2 with Science stream |
| Compulsory Subjects | Physics, Chemistry, and Mathematics or Biology |
| Minimum Percentage — General/OBC-NCL/EWS | 60% aggregate in Class 12 |
| Minimum Percentage — SC/ST/PwD | 55% aggregate in Class 12 |
| Year of Passing Class 12 | 2026 (already passed) or 2027 (appearing) |
| Age Limit | No upper age limit |
| Nationality | Indian nationals, PIOs, and OCIs |
Class 12 Percentage Requirement for IISER IAT 2027
Your Class 12 marks are the most critical eligibility filter for IISER IAT 2027. The minimum percentage differs by category as shown below.
| Category | Minimum Aggregate Percentage in Class 12 |
|---|---|
| General | 60% |
| OBC-NCL | 60% |
| EWS | 60% |
| SC | 55% |
| ST | 55% |
| PwD | 55% |
The percentage is calculated on the basis of the aggregate of all subjects in Class 12, not only the science subjects. Students appearing in Class 12 in 2027 are provisionally eligible and must meet the required percentage when their board results are declared. If you fall short of the threshold after results, your IAT 2027 score will not be considered for admission at any IISER.
Compulsory Subjects in Class 12 for IISER IAT 2027
IISER IAT 2027 requires a specific subject combination in Class 12. Students from both Mathematics and Biology backgrounds are welcome.
| Subject Requirement | Details |
|---|---|
| Mandatory for all students | Physics and Chemistry |
| Third compulsory subject (at least one) | Mathematics or Biology |
| PCMB students | Eligible; having both Mathematics and Biology is permitted |
| PCM students (without Biology) | Eligible |
| PCB students (without Mathematics) | Eligible |
Students who studied Physics, Chemistry, and both Mathematics and Biology (PCMB) are also eligible. The subject combination you studied does not restrict which BS-MS programme you can apply for — that selection happens at the IISER level during counselling.
IISER IAT 2027 Age Limit
There is no upper age limit for IISER IAT 2027. IISERs do not impose a maximum age restriction on students applying through the IAT channel. Your eligibility rests entirely on your Class 12 qualification, subject combination, percentage, and year of passing.
Students who completed Class 12 in a gap year and are now applying for the 2027 session should verify that their year of passing falls within the two-year window specified in the official IISER IAT 2027 prospectus. The final age-limit and year-of-passing policy will be confirmed in the official admission notification published on the IISER admissions portal.
Year of Passing and Number of Attempts for IISER IAT 2027
IISER IAT does not set a fixed cap on total attempts the way JEE Main or NEET UG does. Instead, your eligibility is governed by the year in which you passed Class 12.
| Year of Passing Class 12 | Eligibility Status for IAT 2027 |
|---|---|
| 2027 (appearing in board exams) | Eligible — provisional admission until results |
| 2026 (already passed) | Eligible |
| 2025 or earlier | Not eligible (based on 2026 IAT eligibility trends) |
Based on IISER IAT 2026 eligibility norms, only students who passed Class 12 in 2026 or are appearing in 2027 can register for IAT 2027. This effectively means most students get one or two attempts — once in the year they sit their Class 12 board exam and once the following year as a passed student. Students who passed in 2025 and could not appear for IAT 2026 will not be eligible in 2027. The official IISER IAT 2027 notification will confirm the exact two-year eligibility window.
Other Admission Channels to IISERs
IAT is one of three routes into the IISERs. The same Class 12 percentage eligibility (60% General, 55% reserved) applies across all three channels.
| Channel | Basis of Admission | Who Should Use It |
|---|---|---|
| SCB via IAT | IISER IAT score + Class 12 board eligibility | Students who have not qualified JEE Advanced or KVPY/iSHRARE |
| JEE Advanced | Valid JEE Advanced rank within IISER cutoff | Students who qualify JEE Advanced 2027 with a rank in the IISER bracket |
| KVPY / iSHRARE | Valid KVPY or iSHRARE fellowship score | Students who hold a KVPY or iSHRARE fellowship |
If you qualify JEE Advanced 2027 with a rank that falls within the IISER cutoff, you can opt for that channel and are not required to appear for IAT. You can register under only one admission channel per cycle. Choose the channel in which you have the strongest score before the registration window closes.
IISER IAT 2027 Eligibility Criteria FAQs
Ques. What is the minimum Class 12 percentage required for IISER IAT 2027?
Ans. You need at least 60% aggregate marks in Class 12 if you belong to the General, OBC-NCL, or EWS category. SC, ST, and PwD students need a minimum of 55% aggregate.
Ques. Is there any age limit for IISER IAT 2027?
Ans. No. IISER IAT 2027 does not have an upper age limit. Eligibility is based on your Class 12 qualification and year of passing, not your age.
Ques. How many attempts are allowed for IISER IAT?
Ans. IISER IAT has no fixed attempt cap. You can appear as long as you fall within the year-of-passing window (typically the year of passing and the following year). In practice, most students get one or two attempts.
Ques. Can a PCB student without Mathematics apply for IISER IAT 2027?
Ans. Yes. Students with Physics, Chemistry, and Biology (without Mathematics) are eligible for IISER IAT 2027. You need at least one of Mathematics or Biology along with Physics and Chemistry.
Ques. Is the minimum percentage of 60% calculated only on science subjects?
Ans. No. The 60% (or 55% for reserved categories) is calculated on the aggregate of all subjects in Class 12, not just the Physics, Chemistry, and Mathematics or Biology subjects.
Ques. I passed Class 12 in 2025. Can I appear for IISER IAT 2027?
Ans. Based on 2026 eligibility norms, students who passed Class 12 in 2025 are not eligible for IISER IAT 2027. The exam is open to students who passed in 2026 or are appearing in 2027. Verify this in the official IISER IAT 2027 notification when it is released.
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