IISER IAT 2026 Response Sheet Released: Download, Objections & Score Estimation Guide

IISER IAT 2026 Answer Key & Response Sheet Released

The Indian Institutes of Science Education and Research (IISER) have officially released the IAT 2026 response sheet on June 9, 2026. Candidates who appeared for the IISER Aptitude Test on June 7 can now access their personalised response sheet through the official portal iiseradmission.in. This document contains all the answers marked by each candidate during the exam, allowing them to verify responses, estimate probable scores, and challenge the provisional answer key if needed. The objection window remains open from June 9 to June 13, 2026, providing a limited timeframe to submit challenges. This article delivers a complete walkthrough on downloading the response sheet, understanding the marking scheme, filing objections, and tracking key dates leading up to the final result.

About IISER and the IAT 2026 Examination

IISERs are premier institutions in India dedicated to research and education in basic sciences. The IISER Aptitude Test (IAT) is the national-level entrance exam conducted for admission to the five-year BS-MS dual degree programme across all IISER campuses. IAT 2026 was held on June 7 in multiple shifts across various centres. The exam tests candidates on Physics, Chemistry, and either Mathematics or Biology, depending on the stream chosen. With thousands of aspirants competing for limited seats, the response sheet and answer key are crucial tools for candidates to assess their performance and plan for counselling.

IISER IAT 2026 Response Sheet & Objections

The response sheet is a detailed record of every answer selected by the candidate during the exam. It includes candidate details, question-wise responses, and the paper set. By comparing the response sheet with the provisional answer key, candidates can calculate their probable score and identify any discrepancies. If a candidate believes that the provisional answer key has an error, they can raise an objection by providing supporting evidence. The objection fee is ₹100 per question, which is non-refundable. The final answer key, which will be used for result preparation, will be released after reviewing all objections.

How to File Objections for IISER IAT 2026 Answer Key

Candidates who find discrepancies between their response sheet and the provisional answer key can file objections through the official portal. The process is straightforward but requires careful attention. Follow these steps:

• Visit iiseradmission.in and click on the "Answer Key Objection" link.
• Log in using your User ID (Application Number) and Password.
• View your IAT 2026 response sheet alongside the provisional answer key.
• Select the question(s) you wish to challenge.
• Upload supporting evidence (e.g., reference books, standard formulae) in the prescribed format.
• Pay the objection fee of ₹100 per question (non-refundable).
• Submit the objection before the deadline: June 13, 2026, 11:59 PM.

Note that the objection fee is non-refundable, so candidates should verify their claims thoroughly before submitting. The final answer key will incorporate valid objections and will be used for result calculation.

Step-by-Step Guide to Download IISER IAT 2026 Answer Key

Downloading the IISER IAT 2026 response sheet and answer key is simple. Follow these steps:

1. Go to the official website: iiseradmission.in
2. Click on the "Candidate Login" button on the homepage.
3. Enter your Application Number / User ID and Password.
4. Once logged in, your dashboard will appear.
5. Look for the link titled "IAT 2026 Response Sheet" or "IAT 2026 Answer Key".
6. Click on the link to view the document on screen.
7. Download the PDF by clicking the download icon or button.
8. Save the file for future reference and offline analysis.

Direct link to response sheet: IAT 2026 Response Sheet Login

IISER IAT 2026 Marking Scheme for Score Calculation

To estimate your score, use the official marking scheme:

Steps to Calculate Your Score:

1. Download your response sheet and the provisional answer key.
2. Match each of your responses with the official answer.
3. Count the number of correct answers (C).
4. Count the number of incorrect answers (I).
5. Score = (C × 4) - (I × 1).
6. Unattempted questions do not affect the score.

IISER IAT 2026 Marks vs Percentile Estimate

Based on previous trends, the following table provides a rough percentile estimate:

IISER IAT 2026 Important Dates Timeline

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