Important topics for the IISER entrance exam are updated on this page. Candidates can focus on IAT 2027 important topics for effective preparation and improving the chance to get high rank in the IISER entrance exam 2027. High-weightage chapters for IAT subject wise is provided on this page.
Important topics for IISER Aptitude Test: IISER is a national-level entrance examination for admission to 5 year BS/MS programmes at the Indian Institutes of Science Education and Research (IISER). IAT admission test is a highly competitive examination, and its difficulty level is moderate. Aspirants who are preparing for IAT 2027 must focus on important topics for IISER Aptitude Test. This will help in securing high marks in the exam.
Important topics for IISER Aptitude Test are based on exam analysis of past year. Candidates must practice IISER previous year question paper to get familiar with exam difficulty level and identity high weightage topics. Solving these topics will help to secure good marks in IISER. Candidates can get important topics for IISER Aptitude Test, exam pattern, and marks vs rank on this page.
Also Read: IISER Entrance Exam Preparation: Tips, Strategy & Guide
Explore more Science exams with upcoming dates
30 Oct '26
7 Nov '26
1 Jan '27
7 Jan '27
1 Feb '27 - 24 Apr '27
21 Nov '26
31 Mar '27
- IISER Aptitude Test 2027 Important Topics Chapter-wise
- Advantages of Studying IAT 2027 Important Topics
- IISER 2027 Entrance Exam Pattern
- IISER Marks vs Rank
IISER Aptitude Test 2027 Important Topics Chapter-wise
Check out the IISER Aptitude Test chapter-wise weightage of Mathematics, Physics, Chemistry, and Biology subjects from here:
Important topics for IISER Aptitude Test Physics
Candidates can check high weightage chapters for IAT Physics below.
| 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
Most Important Chapters for IISER Aptitude Test Chemistry
Here we have provided high weightage chapters for IAT Chemistry.
| Chapter | Approx. No. of Questions |
|---|---|
| Atomic Structure | 1 |
| Chemical Bonding | 1–2 |
| Thermodynamics | 1 |
| Equilibrium | 1–2 |
| Redox Reactions & Electrochemistry | 1 |
| Chemical Kinetics | 1 |
| Organic Chemistry – Basics | 1–2 |
| Hydrocarbons & Functional Groups | 2–3 |
| Coordination Compounds | 1 |
| Biomolecules | 1 |
Also Read: IISER marks vs rank
Most Important Chapters for IISER Aptitude Test Mathematics
Candidates can find high-weightage chapters for IAT Mathematics below.
| 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 |
Important Topics for IISER Aptitude Test Biology
| 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 2027 Important Topics
Candidates can check the benefits of reviewing important topics for IISER Aptitude Test below. There are many good reasons to organise your studying around the important topics for the IAT 2027:
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 that can be tested.
IISER 2027 Entrance Exam Pattern
The authority will release the IISER entrance exam pattern online. Candidates can check the exam pattern for IAT 2027 to understand the structure of question paper. IISER Aptitude Test (IAT) is a computer-based test held for 3 hours. IISER question paper will have four sections. Each section will have 15 questions. Every question will carry 4 marks. Negative marking is applied for wrong answers. The total marks for the IISER entrance exam are 240. Moreover, candidates have to attempt any three sections in the IISER exam 2027.
| 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 are 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. Candidates can check their expected rank based on the IISER score below.
| IISER Score (Out of 240) | Expected IISER 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 Cutoff: Check IISER, IISc Bangalore & IIT Madras Cut Off/ Closing Rank Here
News & Updates
Explore Other Exams
1 Aug '26 | CEBS Counselling: Fifth Round ... |
1 Aug '26 - 4 Aug '26 | CEBS Counselling: Payment afte... |
Jun '26 | BVP CET Exam |
10 Dec '25 - 5 Jun '26 | BVP CET 2026 Application Form |
Nov '26 | IIT JAM 2026 Form Correction |
14 Feb '27 | IIT JAM 2027 Exam Day |
Jan '27 | KCET Application Form 2027 |
1 Aug '26 | TIFR GS 2026 Session Starts |
Feb '26 | TIFR GS 2026 Final Result |
Student Forum
Anything you would want to ask experts?Answered 2 months ago
IISER 2027 application portal is expected to open in March 2027. The authority will activate the IISER application form link on the official website.
V
Contributor-Level 10