IISER Exam 2026 Important Topics: Check Subject Wise Important Chapters
Indian Institutes of Science Education and Research Entrance Exam 2026 ( IISER Entrance Exam )
Exam On - 9 Mar '26 - 13 Mar '26
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.
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.
Also Read: IISER Entrance Exam Preparation 2026: Tips, Strategy & Guide
- 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
Also Read: Important Topics of Biology for IISER Entrance Exam 2026; Check Topics and Subject Weightage
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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 a week ago
The last date to apply for IISER 2026 is April 13, 2026. IAT application form will be available on the website, iiseradmission.in.
V
Contributor-Level 10
Answered a week ago
IISER 2026 application is available from March 5 to April 13. Eligible candidates can fill the application form online at iiseradmission.in. The process to fill the application form is registration, form filling, and payment of fees.
V
Contributor-Level 10
Answered a week ago
IISER Berhampur released the application form for IISER 2026 on March 5, 2026. The registration link is updated on the website, iiseradmission.in.
V
Contributor-Level 10
Answered a week ago
IISER 2026 application fee is updated online. The application fee for IISER 2026 is Rs. 2000 (General, EWS, OBC, and OBC-NCL). For other categories, the fee is Rs. 1000.
V
Contributor-Level 10
Answered 2 weeks ago
The official website to check the result of IISER 2026 is iiseradmission.in. Students have to provide the required credentials to check the exam result.
V
Contributor-Level 10
Answered 2 weeks ago
There are 2343 seats, including supernumerary seats for BS-MS / BS / B.Tech. programmes.
BS-MS programme seat matrix
| IISER | Total Seats |
| IISER Berhampur | 300 |
| IISER Bhopal | 300 |
| IISER Kolkata | 280 |
| IISER Kolkata (BS-MS in Computational and Data Sciences) | 30 |
| IISER Pune | 288 |
| IISER Mohali | 275 |
| IISER Thiruvananthapuram | 320 |
| IISER Tirupati | 250 |
V
Contributor-Level 10
Answered 2 weeks ago
The authority has not announced the IISER result date. Students can check the IISER Admisison 2026 website for any updates.
V
Contributor-Level 10
Answered 2 weeks ago
IISER counselling is conducted in multiple rounds. Students who qualify the IISER entrance exam can participate in the counselling process.
V
Contributor-Level 10
Answered 2 weeks ago
IISER entrance exam 2026 is scheduled on June 7, 2026. The exam time is from 9 AM to 12 PM. IISER Berhampur will conduct the IISER Aptitude Test 2026.
V
Contributor-Level 10
Answered 2 weeks ago
The cutoff rank for IISER will be released online. Meanwhile, students can check the previous year cutoff of IISER to know what rank is required for admission.
V
Contributor-Level 10
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