IAT Exam Pattern 2026 – IISER Aptitude Test Paper Pattern
The IAT exam pattern explains the structure of the IISER Aptitude Test conducted for admission to the Indian Institutes of Science Education and Research (IISERs). Candidates searching for the latest IAT Exam pattern 2026, marking scheme, number of questions, and subject-wise distribution will find all details below.
Detailed IISER IAT 2026 Exam Pattern
The IAT exam pattern 2026 describes the structure of the Indian Institutes of Science Education and Research Aptitude Test – a computer-based entrance exam for admission into undergraduate science programs. The exam pattern below reflects official information and trusted published references.
| Exam Name | IISER Aptitude Test (IAT) |
|---|---|
| Conducting Body | Indian Institutes of Science Education and Research Joint Admission Committee |
| Mode | Computer-Based Test (Online) |
| Duration | 3 hours (180 minutes) |
| Number of Questions | 60 objective questions |
| Total Marks | 240 marks |
| Exam Language | English; Hindi may be available (subject to official notification) |
| Type of Questions | Multiple Choice Questions (MCQs); four options with single correct answer |
| Marking Scheme | +4 for each correct answer; −1 for each incorrect answer; 0 for unanswered |
The maximum possible score is 240 and the final rank list is based on this total. Not every candidate may receive a rank – meeting the rank cutoff does not guarantee admission.
Section-Wise Question Distribution
| Subject | No. of Questions | Total Marks |
|---|---|---|
| Physics | 15 | 60 |
| Chemistry | 15 | 60 |
| Mathematics | 15 | 60 |
| Biology | 15 | 60 |
| Total | 60 | 240 |
Each section carries equal weightage, with conceptual questions aligned to the NCERT Class 11 & 12 syllabus.
Question Format and Marking
- All questions are objective-type multiple choice questions
- Each question has four answer options
- Only one option is correct
Details related to marking scheme and negative marking are announced in the official admission notification for the respective year.
IAT Preparation Strategy – Tip
Solving as many official IAT Previous Year Questions (PYQs) as possible is one of the most effective ways to gain an edge over lakhs of candidates.
Eligibility for IAT
- Candidates must have studied at least three of the four subjects – Physics, Chemistry, Biology, Mathematics – at the Class XII level or equivalent. Must have passed Class XII with science subjects.
- A candidate can take the IISER Aptitude Test (IAT) a maximum of three times in consecutive years. The attempts must be in the year of passing the Class 12 (or equivalent) exam, and the next two consecutive years. There is no minimum or maximum age limit for the exam.
- There are no subject-wise cut-offs, but meeting minimum rank criteria is essential for admission.
- The exam is offered once a year and applies to admission across all IISERs for BS / BS-MS programs.
Candidates should verify the attempt criteria in the official notification for the admission year.
Important Instructions
- The test is conducted in a single session
- No sectional time limit is specified
- Use of calculators, mobile phones, or any electronic devices is not permitted
- Rough work must be done on the provided scribble pad
Understanding Score Range & Cut-offs for IISER Admission
While official cutoffs vary by year and category, generalized interpretation from official patterns shows:
- A score closer to the total of 240 indicates a stronger performance.
- Scores across all sections contribute equally due to balanced distribution.
- There are no subject-specific cut-offs, but a good overall score is necessary for top IISERs.
Candidates should refer to the official notification for exact score cut-offs and rank calculations for the respective year.
IAT Exam Pattern vs JEE Main
- IAT includes Biology as a compulsory subject, unlike JEE Main
- IAT focuses on conceptual understanding across all four subjects
- JEE Main emphasizes Physics, Chemistry, and Mathematics only
- The IISER Aptitude Test follows NCERT syllabus more strictly
For JEE Aspirants and PCM Students – Tip
PCM students can successfully crack the IAT by focusing on strengthening their Physics, Chemistry, and Math scores, with basic preparation in Biology for additional marks.
FAQs on IISER IAT Exam Pattern
What is the exam pattern of IISER Aptitude Test?
The IISER Aptitude Test is a computer-based examination consisting of multiple choice questions from Biology, Chemistry, Mathematics, and Physics.
Is IAT conducted online or offline?
The IAT is conducted as an online computer-based test.
Is the IAT exam subjective or objective?
The IAT exam consists entirely of objective-type multiple choice questions.
Are all four subjects compulsory in IAT?
Yes, questions from Biology, Chemistry, Mathematics, and Physics are compulsory for all candidates.
Do I need to attempt questions in Biology (or Mathematics) strictly in IAT?
It is not compulsory to attempt all questions. However, attempting all sections improves the chances of getting top-tier IISERs.
Can a JEE Candidate / PCM Student crack IAT?
Definitely! For PCM Students / JEE Candidates, revising the NCERT Biology can boost scores and secure admission in IISERs.
Are there different requirements for any Specific Courses?
For B.Tech in IISER Bhopal or BS-MS in Computational and Data Sciences at IISER Kolkata, Mathematics in Class XII is mandatory.
Is the IAT exam pattern same every year?
The overall structure remains similar, but candidates should always refer to the official notification for year-specific details.
How many attempts are allowed for a Student?
The attempts must be in the year of passing the Class 12 (or equivalent) exam, and the next two consecutive years. ie., Up to 3 times (e.g., if Class 12 is passed in 2024, you can take it in 2024, 2025, and 2026).
Disclaimer: Information compiled strictly for academic reference based on official IISER admission notifications.
Candidates are advised to refer to the official website for the most up-to-date details.
