IISER Exam 2026 Important Topics: Check Subject Wise Important Chapters
Indian Institutes of Science Education and Research Entrance Exam 2026 ( IISER Entrance Exam )
By examining the important topics of the IAT 2026 for IISER Aptitude Test 2026, test-takers will be able to prepare and be better organized for the IAT 2026, and this can help them score better in the IAT 2026.
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IISER Aptitude Test is a national-level entrance exam. This exam is conducted for admission to BS-MS, BS, or B.Tech. Students who are preparing for the entrance exam must know the important topics for IISER 2026. These topics are mentioned in the IISER exam syllabus. Through the exam syllabus, students can know the IISER important topics for exam preparation. They can know the topics with high weightage by referring to the previous year question paper of IISER. Focusing on the high-weightage topics can help to score good marks in the IISER entrance exam 2026.
The exam authority will prepare the IAT question paper based on the Physics, Chemistry, Mathematics, and Biology exam syllabi. Check the article to know the important topics for IISER, high-weightage topics, exam pattern, and marks vs rank.
- IISER Aptitude Test 2026 Important Topics
- IISER Entrance Exam 2026: Chapter Wise Weightage
- Advantages of Studying IAT 2026 Important Topics
- IISER 2026 Entrance Exam Pattern
- IISER Marks vs Rank
IISER Aptitude Test 2026 Important Topics
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Also Read: Important Topics of Biology for IISER Entrance Exam 2026; Check Topics and Subject Weightage
IISER Entrance Exam 2026: Chapter Wise Weightage
Check out the IISER exam 2026 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
Here is the chapter wise weighatge for the IISER Chemistry paper.
| 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
Students can check the IISER Maths weightage here.
| 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 |
Advantages of Studying IAT 2026 Important Topics
Benefits of Reviewing IAT 2026 Important Topics. There are many good reasons to organise your studying around the important topics for the IAT 2026:
Efficiency and Focus
Maximize Your Exam: When you focus your studying on high-yield topics, you are ensuring that you are spending your study time on aspects that will be most tested and as a result, add to your score.
Confident Test-Taker: Knowing these important areas will lead to a solid understanding of these topics as well, allowing you to feel confident with some of the harder questions on the test.
Strategically Manage Your Time
Identify the Important Topics First: When you prioritise the important topics, you will make sure you have a solid understanding of what will be heavily tested and then proceed to the less frequently tested topics. By following this plan, you will avoid scrambling at the end and not having covered all the important material.
Time for Advanced Topics: As you prioritise the important topics, you will have extra time and a stronger mind to study advanced material for any extra points which can be tested.
IISER 2026 Entrance Exam Pattern
The IISER Entrance Exam Marking Scheme is as follows:
| Subject | No. of Questions | Marks |
| Physics | 15 | 60 |
| Chemistry | 15 | 60 |
| Biology | 15 | 60 |
| Mathematics | 15 | 60 |
| Total | 60 | 240 |
IISER Marks vs Rank
IAT 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.
| IISER 2026 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 |
Read More: IAT Exam Cut Off: Check IISER, IISc Bangalore & IIT Madras Cut Off/ Closing Rank Here
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Student Forum
Anything you would want to ask experts?Answered 4 days ago
There is no fixed number of entering preference for the IISER Entrance Exam counselling process. There are seven IISER institutes offering 11 programmes. Candidates have to select at least one IISER. Higher the number of preferences, better will be their chance of seat allotment.
N
Beginner-Level 5
Answered 4 days ago
Once the IISER Entrance Exam counselling seat allotment result is declared, candidates have the following options.
- FREEZE: By selecting this option, candidates confirm the acceptance of the offer, and that they will not participate in the next rounds of IISER Entrance Exam counselling.
- FLOAT: Selecti
V
Beginner-Level 5
Answered 4 days ago
Seat Acceptance Fee or SAF is the fee to be paid to accept the allotted seat at a particular round of IISER counselling process. Unless the SAF is paid, candidates will not be considered for admission.
L
Beginner-Level 5
Answered 4 days ago
During the IISER Entrance Exam counselling process, seats are allotted based on the following factors.
- Seats available across IISER institutes in the current round of counselling
- IAT Rank obtained by candidates
- IISER preference given by the candidate
- Candidate category.
Candidates are advised to fill as
A
Beginner-Level 5
Answered 4 days ago
IISER does not conduct the counselling or admission process for IISc Bangalore and IIT Madras through the IAT scores. These institutes conduct their own counselling or admission process. IISER counselling process is conducted only for seven IISER institutes located across India.
P
Beginner-Level 5
Answered 4 days ago
The IISER Entrance Exam counselling process is conducted in online mode. Candidates have to register on the exam website and fill in their institute in course choices in order of preference. Based on that, the seat allotment will be released. They can either 'Freeze' the seat and take admission, or
M
Beginner-Level 5
Answered 4 days ago
The IISER entrance exam scores are accepted by 11 IISER institutes across India. Apart from that, IISc Bangalore and IIT Madras also consider the scores for admission to BS courses offered by them.
P
Beginner-Level 5
Answered a week ago
Passed 10+2 from a recognised board in 2024, 2025, or 2026 with minimum 60% marks in aggregate (55% for SC /ST /PwD students) are eligible to apply for IISER exam 2026. Candidates must have taken any three subject among Physics, Chemistry, Mathematics, and Biology in class 12.
V
Contributor-Level 8
Answered a week ago
Indian Institute of Science Education and Research will announce the IISER 2026 exam date on the website, iiseradmission.in/. Students can check the IAT exam date to know the schedule of important events like registration, entrance exam date, admit card, result, and more.
V
Contributor-Level 8
Answered a week ago
No, the admit card for IAT 2026 has not released. The exam authority is expected to release the IISER Aptitude Test admit card 2026 in May 2026. The link to download the admit card will be updated on the IISER admission 2026 website.
V
Contributor-Level 8