If you are preparing for IISER admissions in 2027, understanding the IAT syllabus should be one of your first steps. The IISER Aptitude Test covers Physics, Chemistry, Mathematics and Biology, so students from PCM, PCB and PCMB backgrounds need a clear subject-wise preparation plan.
This guide explains the IAT 2027 syllabus subject by subject, including the major Physics, Chemistry, Mathematics and Biology areas aspirants should prepare from Class 11 and Class 12 concepts.
IAT preparation is not limited to one stream. Physics, Chemistry, Mathematics and Biology are all part of the examination, so build your preparation around all four subjects instead of treating IAT like only JEE or NEET preparation.
IAT 2027 Syllabus Overview
The IISER Aptitude Test is designed to test understanding across the major science subjects studied at the senior-secondary level.
The four subjects are:
- Physics
- Chemistry
- Mathematics
- Biology
This makes IAT preparation different from examinations where students prepare only according to their Class 12 stream.
For example:
- PCM students should not completely ignore Biology.
- PCB students should not completely ignore Mathematics.
- PCMB students need to maintain balance across all four subjects.
The syllabus includes concepts normally encountered across Classes 11 and 12.
Do not assume that your Class 12 stream automatically determines which subjects you should attempt seriously in IAT. Your preparation strategy should consider all four subjects.
IAT Examination Structure You Should Know
Based on the latest officially available IAT structure, the examination consists of questions from all four subjects.
| Subject | Latest Official Structure |
|---|---|
| Physics | 15 questions |
| Chemistry | 15 questions |
| Mathematics | 15 questions |
| Biology | 15 questions |
| Total | 60 questions |
Under the latest official pattern:
- Correct answer: +4 marks
- Incorrect answer: -1 mark
- Unanswered question: 0 marks
- Maximum marks: 240
Use this structure for preparation planning, but always check the official IAT 2027 information brochure once it is released in case the examination authority changes the pattern or syllabus.
IAT 2027 Physics Syllabus
Physics preparation for IAT requires conceptual understanding as well as the ability to apply formulas and principles to unfamiliar questions.
Your preparation should cover the major areas of mechanics, thermal physics, waves, electricity, magnetism, optics and modern physics.
Units and Measurements
- Units and dimensions
- Measurement and errors
- Significant figures
- Dimensional analysis
Kinematics
- Motion in one dimension
- Motion in two dimensions
- Vectors
- Projectile motion
- Relative motion
Laws of Motion
- Newton’s laws of motion
- Force and inertia
- Momentum
- Friction
- Circular motion
Work, Energy and Power
- Work done by forces
- Kinetic energy
- Potential energy
- Work-energy theorem
- Conservation of mechanical energy
- Power
System of Particles and Rotational Motion
- Centre of mass
- Linear momentum
- Torque
- Angular momentum
- Moment of inertia
- Rotational dynamics
Gravitation
- Universal law of gravitation
- Acceleration due to gravity
- Gravitational potential
- Gravitational potential energy
- Satellites
Properties of Matter
- Mechanical properties of solids
- Mechanical properties of fluids
- Pressure
- Surface tension
- Viscosity
Thermal Physics
- Thermal properties of matter
- Heat and temperature
- Calorimetry
- Thermal expansion
- Kinetic theory
- Thermodynamics
- Laws of thermodynamics
Oscillations and Waves
- Simple harmonic motion
- Oscillations
- Wave motion
- Sound waves
- Superposition
- Standing waves
Electrostatics
- Electric charges
- Coulomb’s law
- Electric field
- Electric potential
- Gauss’s law
- Capacitance
Current Electricity
- Electric current
- Resistance
- Ohm’s law
- Electrical energy and power
- Combination of resistors
- Kirchhoff’s laws
Magnetic Effects of Current and Magnetism
- Magnetic field
- Motion of charged particles in magnetic fields
- Biot-Savart law
- Ampere’s law
- Magnetic properties of matter
Electromagnetic Induction and Alternating Current
- Electromagnetic induction
- Faraday’s law
- Lenz’s law
- Alternating current
- Transformers
Optics
- Ray optics
- Reflection
- Refraction
- Lenses
- Optical instruments
- Wave optics
- Interference
- Diffraction
Modern Physics
- Dual nature of radiation and matter
- Photoelectric effect
- Atoms
- Nuclei
- Radioactivity
- Semiconductor concepts
Do not prepare Physics only by memorising formulas. After completing a concept, solve mixed numerical and conceptual questions so that you learn when and how the formula should be applied.
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ClassPe’s Kepler programme is designed for students who want structured IISER IAT preparation with guided learning, practice and testing.
IAT 2027 Chemistry Syllabus
Chemistry preparation can be organised into three major parts:
- Physical Chemistry
- Inorganic Chemistry
- Organic Chemistry
Physical Chemistry
- Some basic concepts of Chemistry
- Mole concept and stoichiometry
- Atomic structure
- States of matter
- Thermodynamics
- Equilibrium
- Redox reactions
- Solutions
- Electrochemistry
- Chemical kinetics
Inorganic Chemistry
- Classification of elements
- Periodicity in properties
- Chemical bonding
- Molecular structure
- p-block elements
- d- and f-block elements
- Coordination compounds
Organic Chemistry
- Basic principles of Organic Chemistry
- Nomenclature
- Isomerism
- Reaction mechanisms and fundamentals
- Hydrocarbons
- Haloalkanes and haloarenes
- Alcohols, phenols and ethers
- Aldehydes and ketones
- Carboxylic acids
- Amines and nitrogen-containing compounds
- Biomolecules
How to Prepare Chemistry for IAT
Use different methods for the three areas.
- Physical Chemistry: Formula understanding and numerical practice.
- Organic Chemistry: Understand reaction mechanisms and maintain reaction maps.
- Inorganic Chemistry: Use regular revision and concise fact sheets.
IAT 2027 Mathematics Syllabus
Mathematics preparation should focus on concept clarity, problem selection and speed.
Sets, Relations and Functions
- Sets
- Operations on sets
- Venn diagrams
- Relations
- Functions
- Composition of functions
- Inverse functions
Basic Counting
- Permutations and combinations
- Fundamental principle of counting
- Binomial theorem
Algebra
- Complex numbers
- Quadratic equations
- Linear inequalities
- Sequences and series
- Matrices
- Determinants
Trigonometry
- Trigonometric functions
- Trigonometric identities
- Inverse trigonometric functions
Coordinate Geometry
- Straight lines
- Circles
- Conic sections
- Parabola
- Ellipse
- Hyperbola
Calculus
- Limits
- Continuity
- Differentiability
- Derivatives
- Applications of derivatives
- Indefinite integrals
- Definite integrals
- Applications of integrals
- Differential equations
Vectors and 3D Geometry
- Vectors
- Vector operations
- Three-dimensional geometry
- Direction ratios and direction cosines
- Lines in three dimensions
Probability and Statistics
- Probability
- Conditional probability
- Independent events
- Random variables
- Basic statistics
Do not wait until the final phase of preparation to begin Mathematics. Even short, regular Mathematics practice throughout the year can be more useful than trying to learn the entire subject close to IAT.
IAT 2027 Biology Syllabus
Biology requires strong conceptual understanding together with accurate recall.
The syllabus can be organised into major areas covering diversity, cell biology, physiology, reproduction, genetics, biotechnology and ecology.
Diversity in the Living World
- The living world
- Biological classification
- Plant kingdom
- Animal kingdom
- Taxonomic categories
Structural Organisation in Plants and Animals
- Morphology of flowering plants
- Anatomy of flowering plants
- Structural organisation in animals
Cell: Structure and Function
- Cell as the unit of life
- Prokaryotic and eukaryotic cells
- Cell organelles
- Biomolecules
- Enzymes
- Cell cycle
- Mitosis
- Meiosis
Plant Physiology
- Photosynthesis
- Respiration in plants
- Plant growth and development
- Plant growth regulators
Human Physiology
- Breathing and exchange of gases
- Body fluids and circulation
- Excretory products and elimination
- Locomotion and movement
- Neural control and coordination
- Chemical coordination and integration
Reproduction
- Sexual reproduction in flowering plants
- Human reproduction
- Reproductive health
Genetics and Evolution
- Principles of inheritance
- Variation
- Molecular basis of inheritance
- DNA and RNA
- Evolution
Biology and Human Welfare
- Human health and disease
- Microbes in human welfare
Biotechnology
- Biotechnology principles
- Biotechnology processes
- Applications of biotechnology
Ecology and Environment
- Organisms and populations
- Ecosystems
- Biodiversity
- Conservation
Biology becomes more manageable when studied regularly through short NCERT-based learning and MCQ sessions. Avoid leaving the entire subject until the last few weeks.
See How ClassPe Students Prepare for IAT
Before choosing an IAT preparation programme, you may also want to see the experiences of students who have prepared with ClassPe.
Does the IAT Syllabus Include Both Class 11 and Class 12?
Yes, aspirants should prepare concepts across both Class 11 and Class 12.
A common mistake is to become completely focused on Class 12 because boards are approaching and allow Class 11 concepts to become weak.
Instead, use a combined preparation system.
| Current Preparation | Recommended Approach |
|---|---|
| Class 12 chapters | Learn thoroughly for boards and then practise IAT-style MCQs and numerical questions from the same topic. |
| Class 11 chapters | Keep them active through revision, short notes, mixed questions and regular tests. |
You do not necessarily need to study one complete Class 11 book followed by one complete Class 12 book.
Instead, maintain both simultaneously.
IAT 2027 Syllabus Strategy for PCM, PCB and PCMB Students
If You Are a PCM Student
Physics, Chemistry and Mathematics will already overlap substantially with your regular academic preparation.
Your additional challenge is Biology.
Start Biology early using:
- NCERT-based reading
- Short notes
- Mind maps
- Chapter-wise MCQs
- Regular revision
Do not try to convert Biology into another Mathematics-style subject.
Recall and conceptual understanding matter.
If You Are a PCB Student
Your additional challenge is Mathematics.
Start with manageable topics and strengthen fundamentals before attempting difficult questions.
Use:
- Formula sheets
- Basic solved examples
- Selected chapter-wise MCQs
- Short but regular Mathematics sessions
If You Are a PCMB Student
Your main challenge is usually not exposure to the subjects but managing four-subject workload.
Rotate subjects across the week instead of trying to give equal time to every subject every day.
How to Use the IAT 2027 Syllabus for Preparation
Simply reading the syllabus does not improve your score.
Convert it into a preparation tracker.
Step 1: Divide Every Subject Into Chapters
Create four separate lists:
- Physics
- Chemistry
- Mathematics
- Biology
Step 2: Mark Your Current Level
You can classify every chapter as:
- Strong: Concept understood and questions can be solved.
- Average: Concept understood but question practice is insufficient.
- Weak: Concept needs to be studied again.
- Not Started: Chapter has not yet been prepared.
Step 3: Complete the Concept
Do not start by solving hundreds of random questions.
First understand the chapter.
Step 4: Practise Questions
After completing the concept:
- Solve chapter-wise MCQs.
- Attempt numerical questions where relevant.
- Include previous-question-style practice.
- Record mistakes.
Step 5: Test the Chapter
Attempt a timed chapter or sectional test.
Step 6: Revisit Weak Chapters
Use your test performance to determine what needs revision.
Syllabus → Concept → Practice → Test → Analysis → Revision → Retest
Practical IAT 2027 Study Plan Using the Syllabus
Instead of studying randomly, divide preparation into stages.
| Preparation Stage | Main Focus |
|---|---|
| Stage 1 | Build concepts and complete major chapters across all four subjects. |
| Stage 2 | Increase chapter-wise MCQs, problem solving and Class 11 revision. |
| Stage 3 | Begin mixed-subject and cumulative tests. |
| Stage 4 | Focus on full-length tests, weak areas, speed and accuracy. |
During Early Preparation
Focus primarily on:
- Understanding concepts
- Completing major syllabus areas
- Developing your weaker fourth subject
During Middle Preparation
Increase:
- DPPs
- Chapter-wise tests
- Class 11 revision
- Mixed-question practice
During Final Preparation
Shift towards:
- Full-length tests
- Revision
- Error-log analysis
- Weak chapter repair
- Question selection
- Time management
Explore ClassPe IAT Preparation Programmes
If you want guided preparation with classes, practice and testing, explore the ClassPe IAT programmes and choose the preparation format suited to your stage.
IAT 2027 Syllabus Preparation Checklist
- Physics Class 11 concepts revised.
- Physics Class 12 concepts prepared.
- Physical Chemistry prepared.
- Organic Chemistry prepared.
- Inorganic Chemistry revised regularly.
- Mathematics fundamentals strengthened.
- Calculus practised.
- Algebra practised.
- Coordinate Geometry practised.
- Biology Class 11 concepts revised.
- Biology Class 12 concepts prepared.
- PCM students have started Biology.
- PCB students have started Mathematics.
- Chapter-wise MCQs attempted.
- Previous-question-style problems practised.
- Weak chapters identified.
- Error log maintained.
- Sectional tests attempted.
- Mixed-subject tests included.
- Full-length testing planned before IAT.
Does IAT include Physics, Chemistry, Mathematics and Biology?
Yes. The latest official IAT structure includes questions from all four subjects: Physics, Chemistry, Mathematics and Biology.
Does the IAT syllabus include both Class 11 and Class 12?
Students should prepare concepts across both Class 11 and Class 12. Ignoring Class 11 while concentrating only on the Class 12 syllabus can create significant gaps during IAT preparation.
Can a PCM student prepare for IAT without Biology?
PCM students can appear for IAT, but completely ignoring Biology can reduce the number of questions available to them during the examination. Starting Biology early through NCERT-based study and selected MCQ practice can improve flexibility.
Can PCB students prepare Mathematics for IAT?
Yes. PCB students can gradually prepare Mathematics by beginning with fundamentals, formula-based chapters and selected question practice. Regular short sessions are generally more manageable than postponing Mathematics until the final preparation phase.
Is NCERT enough for the IAT syllabus?
NCERT can provide an important conceptual foundation, particularly for several Chemistry and Biology areas. However, IAT preparation should also include conceptual MCQs, numerical questions, mixed problems and timed tests so that students learn to apply the concepts under examination conditions.
How should I complete the IAT 2027 syllabus?
Divide the syllabus chapter-wise, identify strong and weak chapters, complete concepts, solve questions, attempt tests and regularly revisit mistakes. Avoid waiting until the entire syllabus is completed before beginning tests.
Which subject is most important for IAT?
It is better not to build your complete strategy around only one subject. The latest official IAT pattern distributes questions across Physics, Chemistry, Mathematics and Biology, so maintaining preparation across the four subjects provides greater flexibility.
When should I start preparing for IAT 2027?
Students can begin well before the examination year reaches its final months. Starting earlier gives you more time to strengthen Class 11 concepts, prepare your fourth subject, practise MCQs and gradually move towards full-length testing.
Final Words
The IAT 2027 syllabus may initially appear large because it combines Physics, Chemistry, Mathematics and Biology.
The solution is not to try to complete everything at the same time.
Break every subject into chapters. Complete concepts systematically, practise questions immediately after learning them, identify weak chapters through tests and keep revising Class 11 alongside Class 12.
PCM students should gradually develop Biology. PCB students should gradually develop Mathematics. PCMB students should focus on maintaining balance across all four subjects.
Most importantly, do not treat syllabus completion as the final objective.
Your real objective is to reach a stage where you can understand a question, identify the relevant concept and apply it accurately within examination time.
Official syllabus reminder:
This IAT 2027 preparation guide is based on the latest officially available IISER Aptitude Test syllabus. Once the Joint Admissions Committee publishes the official IAT 2027 information brochure, students should verify the final syllabus, pattern, eligibility and examination instructions.
Start Your IAT 2027 Preparation with ClassPe
If you want structured IISER preparation rather than preparing every subject independently, explore ClassPe’s IAT programmes and student experiences.
Students are also advised to refer to the official IISER Admissions website for the latest and official information regarding the IAT syllabus, exam pattern, eligibility, dates and admission guidelines.