IISER 2026 Answer Key: IAT Answer Key, How to Calculate Score, Response Sheet

The authority will upload the IISER answer key pdf online. Candidates can download the IAT answer key 2026 through the online application portal. The answer key will be available along with the candidate's digital response. The process to download the IISER 2026 answer key is mentioned below.

• Go to the IISER official website, iiseradmission.in/

• Click on the ‘IISER answer key” link.

• Enter application number (roll number) and password.

• The answer key of IISER was displayed on the screen.

• Take a print out of the answer key and save it for future reference.

IISER answer key objection window will open on June 9, 2026. Candidates have to login through online application portal of IAT and submit their challenge (if applicable). This is a chargeable process and candidates have to pay for each object. They have to pay INR 100 per objections. The process to challenge the IISER answer key is mentioned below.

• Go to IISER 2026 admission website
• Click on IAT answer key objection link
• Now click on the 'Candidates response and objection portal' link
• Click on the login link.
• Enter the user id and password.
• Click on Objection form.
• The form will open. Now students have to click on fill the form link.
• Fill all sections and submit it.
• After submission, students need to pay the objection fees.

Candidates will have to calculate their estimated scores based on the following method:

• For each correct answer, add four marks

• For each wrong answer, deduct one mark

• No marks will be awarded for unattempted questions

Candidates can check IISER marks vs rank to know their rank based on marks obtained in the exam. The higher the marks, the higher the rank. Students must try to score 150+ marks to secure the top rank in IISER. Here we have mentioned the expected IISER marks vs rank.

Also Read: IISER 2026 Marks vs Rank 

Candidates can find the link to the IISER previous year answer key pdf here. The answer key is available with the IISER question paper. Students solving the previous year's questions can use the answer key to cross-check their responses and focus on weaker topics.

Download IAT 2025 Final Question Paper and Answer Key Here: Download Links

• English: Download Now
• Hindi: Download Now

Download IAT 2025 Question Paper and  Provisional Answer Key Here: 

• English: Download Now
• Hindi: Download Now

Also Read: IISER 2026 Question Paper Analysis 

IISER cutoff 2026 will be released online. The cutoff is the minimum rank required for admission to the participating IISER. Students whose rank in IISER is within the closing cutoff will be considered for admission. IISER cutoff 2026 will vary for each category. The authority will consider various factors, like exam difficulty level, number of students qualified in the test, and total number of seats available, to prepare the cutoff rank.

Also Read: IISER Counselling 2026 

IISER Entrance Exam 2023 Final answer key was released by the conducting body on June 28, 2023. IAT 2023 final answer key was the same as of IISER Provisional answer key. The only difference that the candidate will find in the IAT 2023 answer key is the solution to the Question No 14 of Chemistry subject.

For better understanding, candidates can view the question and the answer also which is specified in the final answer key. The rest of the answers are the same as of provisional answer key.

Question 14
In two solutions X (hexane and benzene) and Y (water and HCl), what types of deviations from Raoult’s law are observed?
(a) CORRECT ANSWER No deviation (ideal behaviour) and negative deviation, respectively.
(b) Negative deviation and positive deviation, respectively.
(c) CORRECT ANSWER  Positive deviation and negative deviation, respectively.
(d) Positive deviation and no deviation (ideal behaviour), respectively.

Indian Institutes of Science Education and Research (IISER), the examination conducting body released the IISER Aptitude Test (IAT) 2023 Student Response Sheet on June 20, 2023. Candidates could visit the official website of IISER and after logging in with their credentials can finally view their IAT 2023 Response Sheet. 

IISER candidates can download the provisonal answer key in both the hindi and english languages separately here:

IISER 2023 Answer key_English

IISER 2023 Answer key- Hindi