IISER Previous Year Question Papers & Answer Key; Download PDF
IISER Aptitude Test (IAT) is conducted for admission to BS-MS and BS programs offered by IISERs and participating institutes. IISER previous year question papers and answer keys help candidates understand the exam pattern, difficulty level, important topics, and question trends, making them an essential resource for effective preparation.
IISER 2025 Question Paper & Answer Key PDF Download
| Question Paper PDF | Answer Key PDF |
|---|---|
IISER 2025 IAT Question Paper and Answer Key PDF (May 25, 2025) |
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IISER Aptitude Test consisted of questions from four subjects: Physics, Chemistry, Mathematics, and Biology. Unlike many entrance exams, all candidates were required to attempt questions from every subject regardless of their Class 12 stream.
IISER 2024 Question Paper & Answer Key PDF
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IISER 2024 IAT Question Paper and Answer Key PDF (Jun 9, 2024) |
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The paper included questions from Physics, Chemistry, Mathematics, and Biology. Every candidate was required to attempt questions from all four subjects irrespective of their academic stream.
IISER 2023 Question Paper PDF & Answer Key
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IISER 2023 IAT Question Paper and Answer Key PDF (Jun 17, 2023) |
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For candidates preparing for IISER 2026 and beyond, IISER 2023 Question Paper remains an important practice resource. It provides insight into the level of conceptual understanding expected in the exam and helps students evaluate their preparation against an actual IAT paper.
IISER 2022 Question Paper & Answer Key PDF
| Question Paper PDF | Answer Key PDF |
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IISER 2022 IAT Question Paper and Answer Key PDF (Jul 3, 2022) |
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For candidates preparing for upcoming IISER exam, IISER 2022 Question Paper is an excellent practice resource. It helps aspirants understand the level of conceptual understanding expected in the exam and provides valuable insights into topic distribution, question patterns, and overall exam difficulty.
IISER 2021 Question Paper & Answer Key PDF
| Question Paper PDF | Answer Key PDF |
|---|---|
IISER 2021 IAT Question Paper and Answer Key PDF (Sep 17, 2021) |
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The following resources can help candidates analyze the exam and practice with actual IAT-level questions. The memory-based question paper compiled after the exam provides a good understanding of the topics and concepts tested in IAT 2021.
IISER 2020 Question Paper PDF Download
| Question Paper PDF | Answer Key PDF |
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IISER 2020 IAT Question Paper and Answer Key PDF (Sep 18, 2020) |
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Students are advised to solve the complete paper in a timed environment before checking the solutions.
IISER 2019 Question Paper PDF Download
| Question Paper PDF | Answer Key PDF |
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IISER 2019 IAT Question Paper and Answer Key PDF (Jun 6, 2019) |
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Students should attempt the paper under actual exam conditions to gain the maximum benefit from their practice sessions.
IISER 2018 Question Paper PDF Download
| Question Paper PDF | Answer Key PDF |
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IISER 2018 IAT Question Paper and Answer Key PDF (Jun 24, 2018) |
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Students are encouraged to attempt the paper within the official exam duration to evaluate their preparation level accurately.
IISER 2017 Question Paper PDF Download
| Question Paper PDF | Answer Key PDF |
|---|---|
IISER 2017 IAT Question Paper and Answer Key PDF (Jun 25, 2017) |
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Students should solve the paper without referring to solutions initially to get an accurate assessment of their preparation.
IISER 2016 Question Paper PDF Download
| Question Paper PDF | Answer Key PDF |
|---|---|
| IISER 2016 IAT Question Paper and Answer Key PDF (Jul 3, 2016) | Available Soon |
Candidates should attempt the complete paper in a single sitting to simulate actual exam conditions.
IISER (IAT) Exam Pattern
IISER IAT consists of 60 MCQs, with 15 questions each from Physics, Chemistry, Mathematics, and Biology. Candidates are given 180 minutes to complete the test. The maximum score is 240 marks.
| Particulars | Details |
|---|---|
| Exam Name | IISER Aptitude Test (IAT) |
| Mode of Examination | Computer-Based Test (CBT) |
| Duration | 180 Minutes (3 Hours) |
| Subjects | Physics, Chemistry, Mathematics, Biology |
| Total Questions | 60 |
| Questions per Subject | 15 |
| Question Type | Multiple Choice Questions (MCQs) |
| Total Marks | 240 |
| Marking Scheme | +4 for each correct answer |
| Negative Marking | -1 for each incorrect answer |
| Unattempted Questions | 0 Marks |
Subject-Wise Distribution
| Subject | Questions | Maximum Marks |
|---|---|---|
| Physics | 15 | 60 |
| Chemistry | 15 | 60 |
| Mathematics | 15 | 60 |
| Biology | 15 | 60 |
| Total | 60 | 240 |
IISER Paper Analysis
Based on recent IAT trends and previous-year paper analyses, IISER Aptitude Test is designed to test conceptual understanding, analytical reasoning, and application of Class 11–12 concepts rather than rote memorization.
Key Highlights
- Overall difficulty level is usually Moderate to Difficult.
- Questions focus more on concept application than direct formula-based solving.
- NCERT remains the foundation, especially for Biology and Chemistry.
- Mathematics and Physics are generally the most time-consuming sections.
- Equal weightage is given to Physics, Chemistry, Mathematics, and Biology.
- The paper rewards students with balanced preparation across all four subjects.
IISER IAT Expected Cut Off (Safe Score Range)
The exact cutoff changes every year depending on the paper difficulty, number of candidates, and seat availability. Based on recent admission trends, the following scores can be considered a reasonable target for admission through IAT.
| Category | Expected Cut Off Marks (Out of 240) |
|---|---|
| General (UR) | 120 - 130+ |
| EWS | 110 - 120+ |
| OBC-NCL | 100 - 110+ |
| SC | 65 - 75+ |
| ST | 65 - 75+ |
Safe Scores for Top IISERs (General Category)
| Institute | Safe Score Range |
|---|---|
| IISER Pune | 160+ |
| IISER Kolkata | 145–160+ |
| IISER Bhopal | 130–145+ |
| IISER Mohali | 130–145+ |
| IISER Thiruvananthapuram | 120–135+ |
| IISER Tirupati | 115–130+ |
| IISER Berhampur | 95–115+ |
These are indicative ranges based on recent trends and should be treated as guidance rather than official cutoffs.
IISER FAQS
Ques: What happens after IISER IAT result is declared?
Ans: Qualified candidates need to participate in the online counselling process, where seat allocation is done based on rank, preferences, category, and seat availability.
Ques: Is there a separate counselling registration after the result?
Ans: Yes. Eligible candidates must complete the counselling process and submit their IISER preferences within the specified deadline.
Ques: How are seats allotted in IISER counselling?
Ans: Seat allotment depends on your IAT rank, category, preferred IISER choices, and available seats in each round.
Ques: Can I participate in multiple counselling rounds?
Ans: Yes. Candidates can choose options such as Float or Freeze and may be considered for higher-preference institutes in subsequent rounds.
Ques: What documents are usually required during admission?
Ans: Candidates generally need their Class 10 and 12 certificates, category certificate (if applicable), identity proof, photographs, and other documents specified in the admission brochure.
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