IISER 2025 Question Paper Analysis: IAT 2025 Answer Key (May 25), Diificulty Level & Expected Cut Off
Indian Institutes of Science Education and Research Entrance Exam 2025 ( IISER Entrance Exam )
IISER 2025 Question Paper and Answer Key PDF will be released on May 25, 2025, after the examination is successfully conducted. The exam will be held to test the candidate's domain knowledge in Physics, Mathematics, Biology and Chemistry. Read this Shiksha article to know IAT 2025 Question Paper Analysis and answer key details here.
IISER 2025 Exam Question Paper and Answer Key
IISER 2025 Exam conducted successfully on May 25, 2025 from 9 am to 12 pm at various exam centres across the nation. Exam officials will test candidates domain knowledge in Chemistry, Biology, Physics and Mathematics in the form MCQ questions for the duration of three hours.
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There is a 90% more chance of getting best college recommendations by sharing preferences.The overall IAT 2025 exam difficulty level was moderate. Candidates who had opted for PCM found the Biology section tough to attempt, and candidates who had PCB in their class 12 found the Mathematics subject questions difficult to solve. Topics were equally distributed from the IAT 2025 syllabus. Preparation from NCERT Books will help the candidates to have a good IAT 2025 score.
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The IISER Entrance Exam 2025 pattern is yet to be announced for this year's examination. It has been observed that the IISER Entrance Exam 2025 pattern remains to be same as of the previous year of IISER Entrance Exam which was also conducted in online mode I. e. computer-based. IAT will consist of 60 questions, 15 questions each from Biology Chemistry Mathematics, and Physics. Total time for answering the test will be 180 minutes. Questions will be of multiple choice type with only one correct answer.
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.
The IISER Entrance Exam questions are objective and carries multiple choices (MCQs). Each question will have four answer options. Candidates will have to deduce the correct answer option and click on it with the help of mouse. Since IISER 2025 exam will be conducted in a computer-based mode, test-takers will be able to mark only one answer option. In case it is the correct option, they will get full marks and in case of wrong answer, negative marking scheme will be applied. Hence, candidates must ensure the accuracy of the answer before selecting the answer. Before the final submission, they can change the answer option in case they realise that they have entered a wrong answer option earlier.
Based on the information available regarding the IISER Aptitude Test (IAT), it is essential to understand the structure of the exam:
- Equal Weightage:
- The IAT typically consists of questions from four subjects: Physics, Chemistry, Mathematics, and Biology.
- Each of these sections carries equal weightage. This means that each subject contributes significantly to your overall score.
- The IAT typically consists of questions from four subjects: Physics, Chemistry, Mathematics, and Biology.
- Comprehensive Evaluation:
- The exam is designed to evaluate a candidate's overall scientific aptitude across these core Science disciplines.
- Therefore, attempting questions from all sections, including Physics, is crucial.
- The exam is designed to evaluate a candidate's overall scientific aptitude across these core Science disciplines.
- Scoring and Admission:
- Your overall score in the IAT determines your eligibility for admission to IISERs.
- Skipping any section, including Physics, would significantly impact your score and reduce your chances of admission.
In essence, it is necessary to attempt physics questions in the IISER entrance exam. The exam is designed to test your ability in all four Science subjects.
Indian Institutes of Science Education and Research (IISER), the examination conducting body will release the IISER Aptitude Test (IAT) 2025 Student Response Sheet on second week of June 2025, tentatively. Candidates can visit the official website of IISER and after logging in with their credentials can finally view their IAT 2025 Response Sheet. Candidates can finally tally up their marks scored in the IISER Aptitude Test which will be conducted in the first week of June 2025, tentatively.
IISER 2025 exam was held on May 25, 2025 for the candidates taking admissions to the BS-MS, BS, B.Tech degree courses offered at IISERs, IISc Bangalore, and IIT Madras. After the successful of the examination, the exam officials released the IISER 2025 Student Response Sheet on May 29, 2025.
The IISER Response Sheet 2025 is a specimen that mentions the answers marked by the candidates of the subject for which they have taken the IISER 2025.
ISER 2025 Question Paper and Answer Key
The exam officials will be releasing the IAT 2025 answer key on the official website. Candidates can check the 2025 question paper and answer key from the below-mentioned link.
| IISER 2025 Question Paper & Answer Key |
Available Soon |
IISER 2025 Exam Analysis
Based on the student reactions, IISER 2025 overall exam difficulty level was moderate. Candidates who are from PCB stream found Biology very easy and took more time for Mathematics questions. Equal distribution of subjects and topics was found in the exam. Both the practical and theory-based questions were asked by the exam officials. Many of the students found the physics section as the most difficult section to attend. Questions in physics were mostly application-based based and the electricity topic had the highest weightage of questions.
Questions in biology were technical and practical-based; no repeated questions were asked in this section.
IISER 2025 Exam Difficulty Level
Candidates can check out the IISER 2025 exam difficulty level from here:
| Subject |
Difficulty Level |
Good Attempt |
|---|---|---|
| Biology |
Easy |
12-13 Questions |
| Physics |
Moderate to Difficult |
8-10 Questions |
| Chemistry |
Moderate |
10-12 Questions |
| Mathematics |
Easy to Moderate |
10-12 Questions |
Check out the overall exam difficulty level of IAT 2025 based on Student Reactions:
| Difficulty Level | Percentage |
|---|---|
| Easy | 18% |
| Moderate | 64% |
| Tough | 18% |
IISER Entrance Exam 2025: Chapter Wise Weightage
Check out the IISER exam 2025 chapter wise weighatge of Mathematics, Physics, Chemistry and Biology subjects from here:
Physics Chapter-wise Weightage
| Chapter |
Approx. No. of Questions |
|---|---|
| Kinematics |
1–2 |
| Laws of Motion |
1–2 |
| Work, Energy & Power |
1 |
| Rotational Motion |
1 |
| Thermodynamics |
1–2 |
| Oscillations & Waves |
1 |
| Electrostatics |
1 |
| Current Electricity |
1–2 |
| Magnetism & EMI |
2 |
| Optics |
1–2 |
| Modern Physics (Atoms/Nuclei) |
1–2 |
Chemistry Chapter-wise Weightage
| Chapter |
Approx. No. of Questions |
|---|---|
| Atomic Structure |
1 |
| Chemical Bonding |
1–2 |
| Thermodynamics |
1 |
| Equilibrium |
1–2 |
| Redox Reactions & Electrochem. |
1 |
| Chemical Kinetics |
1 |
| Organic Chemistry – Basics |
1–2 |
| Hydrocarbons & Functional Grps |
2–3 |
| Coordination Compounds |
1 |
| Biomolecules |
1 |
Mathematics Chapter-wise Weightage
| Chapter |
Approx. No. of Questions |
|---|---|
| Sets, Relations & Functions |
1 |
| Trigonometry |
1 |
| Algebra (Complex, Quadratics) |
2 |
| Calculus (Limits, Derivatives) |
2–3 |
| Integrals & Applications |
1–2 |
| Vectors & 3D Geometry |
2 |
| Probability |
1–2 |
| Matrices & Determinants |
1 |
Biology Chapter-wise Weightage
| Chapter |
Approx. No. of Questions |
|---|---|
| Cell Structure & Function |
1–2 |
| Genetics & Evolution |
2–3 |
| Human Physiology |
3–4 |
| Plant Physiology |
2 |
| Reproduction |
1 |
| Biotechnology |
1 |
| Ecology |
2 |
| Diversity of Life/Structural Org. |
1 |
IISER 2025 Expected Cut Off
IAT 2025 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 2025 ranks corresponding to different score ranges.
| IISER 2025 Score (Out of 240) |
Expected IISER 2025 Rank |
|---|---|
| 200 and above |
Rank 1 to 80 |
| 200-160 |
Rank 81- 200 |
| 160- 110 |
Rank 201 to 800 |
| 110-95 |
Rank 800 to 1500 |
| 95-75 |
Rank 1500- 2000 |
| < 60 |
Above 2000 |
Also Read: IISER 2024 Marks vs Rank: Check Cut off and Opening- Closing Ranks
IISER 2024 Question Paper and Answer Key
The exam officials have released the IAT 2024 answer key on the official website. Candidates can also check the 2024 question paper and answer key from the below-mentioned link. Candidates must note that option A of the released questions paper is the correct answer in the PDF.
Download IAT 2024 Question Paper and Answer Key Here:Download Now
Read More: IISER Question Paper Analysis (OUT): IAT 2024 Answer Key Released
Being a post-graduate and BEd degree holder, I'm an innovative, task-driven and immensely motivated science enthusiast, making me a passionate content writer. I love providing meaningful and constructive articles in... Read Full Bio
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Student Forum
Anything you would want to ask experts?Answered 5 days ago
IISER 2025 counselling registration process was started on June 26, 2025. The registration for the counselling is done only for the test takers who have secured an IISER 2025 AIR/Category rank. Earlier, candidates were able to fill out the IISER 2025 counselling registration form till July 3, 2025
S
Beginner-Level 4
Answered a week ago
Yes, while filling out the IISER Decision Making Form, it is absolutely necessary to pay the Seat Acceptance Fee (SAF). This fee is a crucial part of confirming your intent to accept the allotted seat, whether you choose the “Freeze” or “Float” option. Without paying the SAF, your seat will not be r
N
Beginner-Level 4
Answered a week ago
After you fill out the IISER Decision Making Form, the next steps depend on the option you selected—Freeze or Float:
1. If you selected Freeze:
a. Admission Confirmation
b. Your seat is considered final.
c. You will not be considered for further rounds.
2. Document Verification
a. You must upload scanned
P
Beginner-Level 4
Answered a week ago
Filling out the Decision Making Form during IISER counselling is crucial because it determines how your allotted seat is treated in future counselling rounds. Here's why it's important:
1. Confirms your interest in the allotted seat
After each round of seat allocation, you're given options such as:
Fre
Contributor-Level 10
Answered a week ago
Here’s what comes next after the IISER IAT 2025 result:
1. Download your scorecard/rank card
2. Counselling registration & choice filling: The counselling window opens June 26, 2025 (5? PM IST) and closes July 3, 2025 (5? PM IST). During this period, you must log back into the portal, register, and su
L
Beginner-Level 4
Answered 3 weeks ago
Based on the corrections made in the provisional answer key, exam officials will release the IAT 2025 Final answer key in the fourth week of June 2025. The scorecards of IISER 2025 will be made based on the final answer key and test takers will be able to download the scorecard PDF by logging in to
R
Beginner-Level 4
Answered 4 weeks ago
Yes, the IISER Entrance Test is compulsory to get admission into the BS+MS course at IISER Pune. On the basis of a candidate's score in the IISER entrance exam (also known as the IISER aptitude test), candidates can secure admission to the IISER Pune BS+MS course. After evaluating applicants' scores
R
Contributor-Level 10
Answered 4 weeks ago
No, candidates cannot take admission in IISSER Pune BS+MS course without the IISER Entrance Exam. Candidates willing to take admission in the BS-MS course at Indian Institutes of Science Education and Research (IISERs) must appear for the IISER entrance exam, also known as the IISER aptitude test. C
K
Contributor-Level 10
Answered a month ago
The expected application fee for IISER Entrance Exam 2025 of various categories is as follow:
1. INR 2,000/- for candidates applying under General, EWS, and OBC-NCL categories.
2. INR 1,000/- for candidates applying under persons with disabilities, persons registered as Kashmir migrants and SC/ST cat
T
Contributor-Level 10
Answered a month ago
Following the previous year trends and as per the updates mentioned on the IISER 2025 official website, IISER do not release IAT 2025 cut off marks. However, the exam officials based on the counselling registration done for admissions by the candidates, the exam officials releases the round wise IIS
N
Contributor-Level 10
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