IISER IAT 2026 Answer Key Released: Download Response Sheet, Raise Objections from June 9

IISER IAT 2026 Answer Key Released: The Indian Institutes of Science Education and Research (IISER) have officially released the provisional answer key for the IISER Aptitude Test (IAT) 2026. Candidates who appeared for the highly competitive entrance examination can now access the answer key through the official IISER admission portal and estimate their probable scores before the declaration of results.

The release of the answer key marks an important step in the admission process, allowing candidates to review their responses and identify any discrepancies. Along with the provisional answer key, IISER has announced that candidate response sheets and the objection submission window will be made available from June 9, 2026. Candidates who find errors in the provisional answer key will be able to challenge specific questions by submitting objections through the official website.

IISER IAT 2026 Answer Key Released

The IISER Aptitude Test (IAT) 2026 was conducted on June 7, 2026, in a computer-based mode for admission to various undergraduate science and research programs offered by IISERs and participating institutions across India. Shortly after the completion of the examination, IISER published the provisional answer key to maintain transparency in the evaluation process.

Candidates can use the answer key to compare their responses and calculate an estimated score before the official results are announced. The provisional answer key serves as a preliminary version and may undergo revisions if valid objections are submitted by candidates.

Key Highlights of IISER IAT 2026 Answer Key

Particulars	Details
Exam Name	IISER Aptitude Test (IAT) 2026
Conducting Body	IISER Admissions Committee
Exam Date	June 7, 2026
Answer Key Status	Released
Response Sheet Release	June 9, 2026
Objection Window Opens	June 9, 2026
Official Website	iiseradmission.in
Mode of Examination	Computer-Based Test (CBT)

How to Download IISER IAT 2026 Answer Key

Candidates can follow these steps to access the provisional answer key:

Visit the official IISER Admissions portal.
Navigate to the latest notifications section on the homepage.
Click on the “IAT 2026 Provisional Answer Key” link.
Log in using your application credentials if required.
Download the answer key PDF.
Save and print a copy for future reference.

The answer key contains the correct responses for all questions asked in the examination and can be used for calculating expected scores.

Response Sheets to Be Available from June 9

Along with the answer key, IISER will also release individual response sheets for candidates on June 9. These response sheets will contain the answers marked by candidates during the examination.

By comparing the response sheet with the provisional answer key, candidates can accurately estimate their performance and likely rank in the examination. The response sheet acts as an official record of the answers submitted by candidates during the test.

How to Calculate IISER IAT 2026 Score

Candidates can estimate their probable score using the official marking scheme.

Marking Scheme

Response Type	Marks Awarded
Correct Answer	+4
Incorrect Answer	-1
Unanswered Question	0

The IAT consists of 60 multiple-choice questions covering Physics, Chemistry, Mathematics, and Biology. The maximum score is 240 marks.

Formula for Score Calculation

Estimated Score = (Number of Correct Answers × 4) – (Number of Incorrect Answers × 1)

Using this formula, candidates can get a rough estimate of their performance before the declaration of official results.

Objection Window Opens on June 9

Candidates who find discrepancies in the provisional answer key can submit objections beginning June 9, 2026. IISER has provided this facility to ensure fairness and accuracy in the evaluation process.

Before submitting an objection, candidates should carefully verify the answer and gather supporting documents or academic references to justify their claim. After reviewing all objections, IISER will publish the final answer key.

Only objections supported by valid evidence are likely to be considered by the expert committee.

Why the Objection Process is Important

The objection facility gives students an opportunity to challenge potentially incorrect answers and helps maintain transparency in the examination process.

Benefits include:

Ensuring fairness in evaluation.
Correcting any mistakes in the provisional key.
Providing candidates with a chance to present valid evidence.
Improving the accuracy of final results.

Once all objections are reviewed, the final answer key will be published, and results will be prepared based on the revised answers, if any changes are made.

About IISER IAT 2026

The IISER Aptitude Test (IAT) is one of India’s most prestigious science entrance examinations. It serves as the gateway for admission to undergraduate science and research programs offered by IISERs and several participating institutions.

The examination assesses candidates in four core subjects:

Physics
Chemistry
Mathematics
Biology

The test is conducted annually in a computer-based format and attracts thousands of students aspiring to pursue careers in scientific research and innovation.

What Happens Next?

After the response sheets and objection window become available on June 9, candidates should:

Download their response sheet.
Compare responses with the provisional answer key.
Calculate their expected score.
Submit objections if necessary.
Wait for the release of the final answer key.
Track the announcement of results and counselling schedules.

Candidates are advised to regularly visit the official IISER admission portal for the latest updates regarding answer key challenges, final results, rank lists, and admission counselling.