The IISER Aptitude Test Answer Key 2026 will be released after the conduct of the IISER Aptitude Test 2026 on 7 June 2026 at the official IISER admission portal iiseradmission.in. The IISER Aptitude Test Answer Key 2026 is the official solution document containing the correct answers to all 60 MCQs asked in the IAT 2026 entrance exam – 15 each from Physics, Chemistry, Mathematics, and Biology. With the marking scheme of +4 for correct and -1 for incorrect answers and a maximum of 240 marks, candidates can use the IISER Aptitude Test Answer Key 2026 along with the IAT 2026 Response Sheet to calculate their probable score. The provisional IISER Aptitude Test Answer Key 2026 will be open for objections / challenges from candidates for a limited period, after which the Final Answer Key will be used to prepare the IAT 2026 Result.
Latest: – IISER Aptitude Test 2026 will be conducted on 7 June 2026 (9 AM – 12 Noon IST). IISER Aptitude Test Answer Key 2026 (Provisional) will be released shortly after the exam at iiseradmission.in. Objection window expected from June 9 to June 13, 2026.
IISER Aptitude Test Answer Key 2026
What is the IISER Aptitude Test Answer Key 2026?
The IISER Aptitude Test Answer Key 2026 is the official PDF document published by the Joint Admissions Committee of the IISERs (with IISER Berhampur as the 2026 conducting institute) containing the correct answers to each of the 60 Multiple Choice Questions (MCQs) asked in the IAT 2026 entrance examination on 7 June 2026. The IISER Aptitude Test Answer Key 2026 is released in two phases – a Provisional Answer Key (open for objections / challenges from candidates) and a Final Answer Key (used to prepare the IISER Aptitude Test Result 2026). Along with the IAT 2026 Response Sheet (which displays each candidate’s recorded responses), the IISER Aptitude Test Answer Key 2026 enables candidates to calculate their expected IAT 2026 score before the official result declaration.
IISER Aptitude Test Answer Key 2026 Direct Link – Candidates can check and download the IISER Aptitude Test Answer Key 2026 from the official IISER admission portal iiseradmission.in after the conduct of IAT 2026 on 7 June 2026.
IISER Aptitude Test Answer Key 2026 Important Dates
| Event | Date (2026) |
|---|---|
| IISER Aptitude Test Admit Card 2026 Release | 24 May 2026 |
| IAT 2026 Exam Date | 07 June 2026 (9:00 AM – 12:00 Noon IST) |
| IISER Aptitude Test Answer Key 2026 (Provisional) | June 2026 (Post-Exam) |
| IAT 2026 Response Sheet Release | June 2026 (Post-Exam) |
| IAT 2026 Objection Window | 09 – 13 June 2026 (Tentative) |
| IISER Aptitude Test Answer Key 2026 (Final) | 4th week of June 2026 (Tentative) |
| IISER Aptitude Test Result 2026 | June 2026 |
How to Download IISER Aptitude Test Answer Key 2026
Follow these steps to download the IISER Aptitude Test Answer Key 2026 from the official IISER admission portal:
- Visit the official IISER admission portal at iiseradmission.in after the IAT 2026 exam on 7 June 2026.
- Click on the “IISER Aptitude Test 2026 Provisional Answer Key” link in the latest notifications section.
- Enter your IAT 2026 Application Number (User ID) and Password (where login is required).
- The IISER Aptitude Test Answer Key 2026 PDF will open on the screen.
- If multiple paper sets / shifts are released, download the answer key PDF corresponding to your IAT 2026 set / shift.
- Match the IISER Aptitude Test Answer Key 2026 against your responses (using the IAT 2026 Response Sheet, if available).
- Apply the IAT 2026 marking scheme (+4 / -1) to calculate the expected IAT 2026 score.
- Save and print the IISER Aptitude Test Answer Key 2026 PDF for future reference.
How to Calculate IAT 2026 Score Using Answer Key
Candidates can calculate their probable IAT 2026 score using the IISER Aptitude Test Answer Key 2026 and Response Sheet with the following formula:
- IAT 2026 Marking Scheme: +4 marks for each correct answer; -1 mark (negative marking) for each incorrect answer; 0 marks for unattempted questions.
- Compare your responses (from the IAT 2026 Response Sheet) against the correct answers (from the IISER Aptitude Test Answer Key 2026).
- Count the total number of correct responses (C).
- Count the total number of incorrect responses (I).
- Apply the formula: Expected IAT 2026 Score = (C × 4) – (I × 1)
- The maximum possible IAT 2026 score is 240 (for 60 MCQs, +4 each).
- Use the calculated score along with past-year cut-offs to estimate your IAT 2026 rank and IISER admission chances.
IISER Aptitude Test 2026 Objection / Challenge Process
The IISER Aptitude Test Provisional Answer Key 2026 will be open for objections / challenges from registered candidates for a limited period (expected 9-13 June 2026):
- Visit the official IISER admission portal at iiseradmission.in during the open objection window.
- Click on the “IISER Aptitude Test 2026 Answer Key Objection / Challenge” link.
- Login with the IAT 2026 Application Number (User ID) and Password.
- Select the question number being challenged.
- Choose the option you believe is the correct answer.
- Upload supporting evidence / references for the challenge (NCERT textbook, peer-reviewed publications, etc.).
- Pay the challenge fee per question (non-refundable for rejected challenges).
- Submit the objection and save the acknowledgement for future reference.
The IISER expert committee reviews all challenges. If accepted, the change is reflected in the IISER Aptitude Test Final Answer Key 2026, which is used to prepare the IISER Aptitude Test Result 2026.
IAT 2026 Provisional vs Final Answer Key
| Particular | Provisional Answer Key | Final Answer Key |
|---|---|---|
| Release Time | Shortly after IAT 2026 exam | After objection review (4th week June) |
| Purpose | Self-assessment + Objection | Result preparation |
| Open for Objection? | Yes (9-13 June 2026 tentative) | No |
| Subject to Change? | Yes (if objections accepted) | No (Final) |
| Used For Result? | No | Yes (IAT 2026 Result) |
IAT 2026 Response Sheet
Alongside the IISER Aptitude Test Answer Key 2026, IISER also releases the IAT 2026 Response Sheet for each candidate. The IAT 2026 Response Sheet displays the candidate’s individually recorded responses in the IAT 2026 entrance exam – for each of the 60 MCQs, it shows which option (A / B / C / D) the candidate selected. Combined with the IISER Aptitude Test Answer Key 2026, the IAT 2026 Response Sheet enables the precise calculation of a candidate’s expected IAT 2026 score. The response sheet is accessible via candidate login (Application Number + Password) at iiseradmission.in.
IISER Aptitude Test 2026 Exam Pattern (Reference)
| Particular | Details |
|---|---|
| Exam Name | IISER Aptitude Test 2026 (IAT 2026) |
| Mode of Exam | Computer-Based Test (CBT) |
| Total Duration | 3 hours (180 minutes) |
| Total Questions | 60 MCQs (15 each from Physics, Chemistry, Mathematics, Biology) |
| Marking Scheme | +4 for correct; -1 for incorrect; 0 for unattempted |
| Maximum Marks | 240 |
| Medium | English |
IISER Aptitude Test Answer Key 2026 FAQs
The IISER Aptitude Test Answer Key 2026 (Provisional) is expected to be released shortly after the IAT 2026 exam conducted on 7 June 2026, at the official IISER admission portal iiseradmission.in. The Final IAT 2026 Answer Key, used for preparing the result, is expected in the 4th week of June 2026 after the objection review.
Candidates can download the IISER Aptitude Test Answer Key 2026 by visiting iiseradmission.in after the IAT 2026 exam, clicking the ‘IAT 2026 Provisional Answer Key’ link, and logging in with their Application Number (User ID) and Password (if required). The answer key PDF is then available for download, displaying correct options for all 60 MCQs.
The IISER Aptitude Test 2026 follows a marking scheme of +4 marks for each correct answer, -1 mark (negative marking) for each incorrect answer, and 0 marks for unattempted questions. With 60 MCQs in total (15 each from Physics, Chemistry, Mathematics, and Biology), the maximum possible IAT 2026 score is 240.
Using the IISER Aptitude Test Answer Key 2026 and IAT 2026 Response Sheet, candidates can calculate their expected score using the formula: Expected Score = (Number of Correct × 4) – (Number of Incorrect × 1). For example, 40 correct and 15 incorrect = (40×4) – (15×1) = 160 – 15 = 145 marks. The maximum achievable score is 240 (60 MCQs × 4).
Yes, IISER opens an objection / challenge window after releasing the Provisional IISER Aptitude Test Answer Key 2026 (expected 9-13 June 2026). Candidates can challenge specific questions by logging in at iiseradmission.in, selecting the question and proposed correct answer, uploading supporting references, and paying the challenge fee. Accepted challenges are reflected in the Final IAT 2026 Answer Key.
The IAT 2026 Provisional Answer Key is released first, shortly after the exam, and is open for objections / challenges from candidates. After the IISER expert committee reviews all valid objections, the Final IAT 2026 Answer Key is published. The Final Answer Key is used to prepare the IISER Aptitude Test Result 2026 and is binding on all candidates.
The IAT 2026 Response Sheet displays each candidate’s individually recorded responses (the option A / B / C / D selected) in the IAT 2026 exam, while the IISER Aptitude Test Answer Key 2026 shows the official correct answers for all 60 MCQs. Used together, they allow candidates to precisely calculate the expected IAT 2026 score by applying the +4 / -1 marking scheme.
Quick Links
- IISER Aptitude Test 2026 Main Page
- IISER Aptitude Test Admit Card 2026
- IISER Aptitude Test Result 2026
- IISER Aptitude Test Syllabus 2026
IISER Aptitude Test Answer Key 2026 – Overview
| Particular | Details |
|---|---|
| Document Name | IISER Aptitude Test Answer Key 2026 / IAT 2026 Answer Key |
| Releasing Authority | IISER Berhampur (Joint Admissions Committee) |
| Exam Name | IISER Aptitude Test 2026 (IAT 2026) |
| IAT 2026 Exam Date | 07 June 2026 |
| Provisional Answer Key Release | June 2026 (Post-Exam) |
| Objection Window | 09 – 13 June 2026 (Tentative) |
| Final Answer Key Release | 4th week of June 2026 |
| Mode of Release | Online (PDF on iiseradmission.in) |
| Answer Key Type | Provisional + Final |
| Total Questions / Marks | 60 MCQs / 240 marks |
| Marking Scheme | +4 correct, -1 incorrect, 0 unattempted |
| Usage | Score calculation, objection, result preparation |
| Result Declaration | June 2026 |
| Official Website | iiseradmission.in |
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