IISER Exam 2026 Important Topics: Check Subject Wise Important Chapters
Indian Institutes of Science Education and Research Entrance Exam 2026 ( IISER Entrance Exam )
Objection
9 Jun '26 - 13 Jun '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 organised for the IAT 2026, and this can help them score better in the IAT 2026.
IISER important topics are mentioned on this page. Candidates who are preparing for the IISER Aptitude Test can check the subject-wise important topics and prepare for the exam accordingly. Focusing on important topics will help to obtain high marks in the IISER entrance exam. Candidates must know that the IISER important topics mentioned here are based on past year exam analysis. The majority of IAT questions will be based on the IISER important topics. The IISER question paper will be based on Physics, Chemistry, Mathematics, and Biology. Students can also practice the IISER question paper to know the exam difficulty levels. and self-assessment.
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
Here we have mentioned important topics for the IISER 2026 chapter-wise.
Commonly asked questions
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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 |
Also Read: IISER entrance exam syllabus 2026
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 |
Also Read: IISER 2026 marks vs rank
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 |
Also Read: Last-minute preparation tips
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
Maximise 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 authority has released the IISER exam pattern online on the official website. Students can check the exam pattern to know the structure of question paper. They will also get to know the marking scheme of IISER 2026. There will be 60 questions in the IISER question paper. The total marks of IISER 2026 is 240 marks. For detailed exam pattern of IISER 2026 check below.
| 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 Yesterday
In such a situation, you have to prioritise which exam you want to appear for. You might have prepared for months for the exam. Based on your preparation, you have to decide which exam you can easily qualify for and get admission to the desired course and college.
V
Contributor-Level 10
Answered 2 days ago
Yes, the IAT response sheet for 2026 is officially out. You can check your response sheet on the official IISER admissions portal through your login credentials.
S
Beginner-Level 5
Answered 3 weeks ago
Students can create an IISER login id and password during registration. The details required to register for IISER are Name, Date of birth, gender, citizenship status, mobile number, and email address.
V
Contributor-Level 10
Answered 3 weeks ago
No, IISER registration was over on April 13, 2026. Students were able to register for IAT 2026 from March 5 to April 13.
V
Contributor-Level 10
Answered 3 weeks ago
IAT user id is (application number / registration number). It is created during the IISER registration process. After the registration is over, user id and password are sent to the registered email address and mobile number.
V
Contributor-Level 10
Answered 2 months ago
IISER answer key was released on June 7, 2026. Candidates can download the answer key online. The answer key challenge window was open on June 9, 2026.
V
Contributor-Level 10
Answered 2 months ago
The IISER exam date was June 7, 2026. The exam timing was from 9 AM to 12 PM. Candidates had to report to the exam centre by 7 AM.
V
Contributor-Level 10
Answered 2 months ago
IISER score 200 or above is a good marks. It can help to get admission to IISER Pune and IISc Bangalore. Candidates must have a good conceptual knowledge, give priority to all four subjects. Prepare for the exam according to the exam syllabus and take mock test to score above 200.
V
Contributor-Level 10
Answered 2 months ago
Based on previous year analysis, IAT exam is moderately difficult. It requires strong conceptual knowledge. Students who have prepared properly for exam can easily score good marks.
V
Contributor-Level 10
Answered 2 months ago
It is quite difficult for the GEN / OBC category to get admission to IISER with 50 marks. Even the reserved category students have less chance in the later counelling round for admission. To secure admission, students must score above 150 marks.
V
Contributor-Level 10