IISER Question Paper Analysis : IAT Answer Key Released @iiseradmission.in

The IISER Aptitude Test (IAT) 2026 is likely to be held during the third week of May 2026, with the announcement for the same will be likely in February 2026, and for registration is likely in March 2026. Application for the admission is to be made through the official IISER admissions website.

The IAT 2026 exam will be conducted successfully in June month, 2026, tentatively for admissions to five-year BS-MS and BS dual degree programmes at IISERs institutions across the nation. The exam was held for three hours in one shift, ie., the Morning shift from 9 am to 12 pm and the afternoon shift from 12:30 pm to 3:30 pm. The exam officials tested the candidate's domain knowledge in Chemistry, Biology, Physics and Mathematics subject. 

After the successful conduction of the IISER 2025 exam June month, 2025, the exam officials on the same day had released the IISER 2025 answer key. Candidates who have taken the IAT 2025 examination will be to check the correct answers to the questions they had attempted. IAT question paper analysis and student reaction will be available for the candidates to get an idea about the difficulty level and expected cut-off form here. 

The IISER 2025 analysis will provide the exam difficulty level and expected cut-off. The IAT 2025 question paper here in this article is designed after the IISER 2025 analysis and students' reactions. IISER 2025 questions have become very dynamic, and questions are more based on a practical and analytical approach than one-word answers. In the coming years, the questions will come from the disciplines, that are flourishing in the science domains, and there is no such need to mug up the concepts.

IISER Question Paper and Answer Key

The exam officials have released the IAT answer key on the official website. Candidates can also check the question paper and answer key from the link. Candidates must note that option A of the released questions paper is the correct answer in the PDF.

Download IAT Question Paper and Answer Key Here:Download Now 

Based on the IAT 2026 student reactions and questions paper analysis, here is the analysis of the exam difficulty level and good attempt of the sections asked in the examination. 

IAT 2025 Exam Analysis

Students who had opted for PCM in their class 12 std, found the biology section comparatively moderate to difficult and the students who had opted PCB in their class 12 found the Mathematics portion to be moderately difficult. for the common subjects for both the stream students which are Chemistry and Physics, the exam difficulty level was moderately easy. The overall difficulty level of IISER Entrance Exam 2025 was found to be moderate. It was also found that many questions were indirectly repeated from the previous year questions on the subjects biology and mathematics. In the physics sections questions were maximum asked from theory-based type instead of numerical-based questions. 

Some candidates who had appeared in the JEE exam found the exam difficulty level the same as the JEE exam.

IISER 2026 Expected Cut Off

IAT 2026 candidates' ranks will be based on their combined scores from the four sections (Physics, Chemistry, Mathematics and Biology). The exam comprises 60 questions with a total score of 240 marks. Below is a table for the expected IISER 2026 ranks corresponding to different score ranges.

Also Read: IISER 2026 Marks vs Rank: Check Cut off and Opening- Closing Ranks 

IISER Entrance Exam 2026 Expected Exam Pattern