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Here are the high weightage chapters for the IISER Aptitude Test (IAT) 2025 in all four subjects:

Physics – High Weightage Chapters

• Kinematics

• Laws of Motion

• Work, Energy & Power

• Rotational Motion

• Thermodynamics

• Oscillations & Waves

• Electrostatics

• Current Electricity

• Magnetism & Electromagnetic Induction

• Optics

• Modern Physics (Atoms, Nuclei)

  Recommended

These chapters usually get 1–2 questions each, with Magnetism, Modern Physics, and Current Electricity often having slightly higher weightage (https://www.shiksha.com/science/articles/important-topics-for-iiser-aptitude-test-blogId-166793) (https://mystudycart.com/iiser-aptitude-test-syllabus) .

Chemistry – High Weightage Chapters

• Atomic Structure

• Chemical Bonding

• Thermodynamics

• Equilibrium

• Redox Reactions & Electrochemistry

• Chemical Kinetics

• Organic Chemistry (Basics, Reactions)

• Hydrocarbons & Functional Groups

• Coordination Compounds

• Biomolecules

Organic Chemistry (especially reactions and basics), Hydrocarbons, and Chemical Bonding are very frequently asked (https://www.shiksha.com/science/articles/important-topics-for-iiser-aptitude-test-blogId-166793) (https://mystudycart.com/iiser-aptitude-test-syllabus) .

Mathematics – High Weightage Chapters

• Sets, Relations & Functions

• Trigonometry

• Algebra (Complex Numbers, Quadratic Equations)

• Calculus (Limits, Derivatives, Integrals & Applications)

• Vectors & 3D Geometry

• Probability

• Matrices & Determinants

Calculus, Algebra, and Vectors/3D Geometry are major focus areas. (https://www.shiksha.com/science/articles/important-topics-for-iiser-aptitude-test-blogId-166793) (https://mystudycart.com/iiser-aptitude-test-syllabus)

Biology – High Weightage Chapters

• Cell Structure & Function

• Genetics & Evolution

• Human Physiology

• Plant Physiology

• Reproduction

• Biotechnology

• Ecology

• Diversity of Life/Structural Organization

Human Physiology, Genetics, and Cell Biology have the most questions, followed by Ecology and Plant Physiology (https://www.shiksha.com/science/articles/important-topics-for-iiser-aptitude-test-blogId-166793) (https://www.shiksha.com/science/articles/iiser-entrance-exam-important-topics-for-biology-blogId-197898) (https://mystudycart.com/iiser-aptitude-test-syllabus) .

Quick Summary Table

Tip:
Focus more on these chapters for revision, but don’t skip the rest, as questions can come from anywhere in the syllabus (https://www.shiksha.com/science/articles/important-topics-for-iiser-aptitude-test-blogId-166793) (https://mystudycart.com/iiser-aptitude-test-syllabus) (https://www.shiksha.com/science/articles/iiser-entrance-exam-important-topics-for-biology-blogId-197898) .
Practice previous year questions from these topics for best results.