IISER Exam 2026 Important Topics: Check Subject Wise Important Chapters
Indian Institutes of Science Education and Research Entrance Exam 2026 ( IISER Entrance Exam )
IISER Aptitude Test 2026 Hall Ticket
24 May '26 - 7 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 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
Commonly asked questions
Explore more Science exams with upcoming dates
1 Nov '25 - 29 Apr '26
30 Apr '26
CUET
2 May '26
3 May '26
15 May '26
29 May '26
23 Mar '26 - 30 Apr '26
1 May '26
10 May '26 - 31 May '26
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
News & Updates
Explore Other Exams
14 Apr '26 - 6 Jun '26 | NEST 2026 Mock Test |
15 May '26 | NEST 2026 Admit Card |
10 Dec '25 - 5 Jun '26 | BVP CET 2026 Application Form |
Jun '26 | BVP CET Exam |
27 Mar '26 - 6 May '26 | Last date to freeze choice |
25 May '26 | First Allotment |
27 Apr '26 - 30 Apr '26 | KCET Answer Key 2026 |
May '26 | KCET Result 2026 |
1 Aug '26 | TIFR GS 2026 Session Starts |
Feb '26 | TIFR GS 2026 Final Result |
Jan '26 | ICAR AIEEA PG 2025 Round 4 Cou... |
Jan '26 | ICAR AIEEA PG 2025 Round 4 Cou... |
Student Forum
Anything you would want to ask experts?Answered a month ago
IISER answer key will be released on June 7, 2026. Candidates can download the answer key online. The answer key challenge window will open on June 9, 2026.
V
Contributor-Level 10
Answered a month ago
The IISER exam date is June 7, 2026. The exam will commence at 9 AM and continue till 12 PM. It is a computer-based test.
V
Contributor-Level 10
Answered a month 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 a month 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 a month 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
Answered a month ago
IISER exam is considered of moderate difficulty level. Majority of students finds Physics, and Mathematics challenging. PCM students may find biology tough while PCB students might find Mathematics tough. However, the difficulty level of IISER compared to JEE Main and Advanced is moderate to easy.
V
Contributor-Level 10
Answered a month ago
The last date to apply for IISER 2026 was April 13, 2026. IAT application form was available on the website, iiseradmission.in.
V
Contributor-Level 10
Answered a month 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 month 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 month 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
Rakshit Prabhakar is a content writer with 2 years of experience. He is an alumnus of Guru Gobind Singh Indraprastha University, where he did Bachelor in Journalism and Mass Communication. This gives him a solid bas
Read Full Bio