Science (Physics, Chemistry And Biology)

This is a complete, free study companion for Science (Physics, Chemistry And Biology) — built around what the exam actually asks. The topics examiners repeat most are Diagram-based questions in Biology, Chemical equations, balancing, and reaction classification, and Human anatomy: digestion, respiration, skeleton, skin, neuron. The syllabus runs to 23 chapters. Below you'll find the full topic-frequency ranking, the exam paper pattern, every chapter, a step-by-step study plan, and the official downloads — everything in one place.

Everything here is free. We're an independent student resource, not the official ICSE & ISC body, so always confirm the current syllabus and exam dates on the official ICSE & ISC website before you rely on them.

Key information

Level: Class 9
Exam: School Based Examination
Conducted by: Council for the Indian School Certificate Examinations (CISCE)

Most frequently examined topics

#	Topic	Times asked
1	Diagram-based questions in Biology	8
2	Chemical equations, balancing, and reaction classification	6
3	Human anatomy: digestion, respiration, skeleton, skin, neuron	6
4	Atomic structure, electronic configuration, isotopes, valency	6
5	Light: ray diagrams, mirrors, image formation, magnification	5
6	Water: hardness, crystallization, solubility, softening	5
7	Flowering plants: flower, pollination, fertilisation, seed	5
8	Electricity and magnetism: circuits, cells, magnets, polarity	5
9	Motion graphs, velocity, retardation, force calculation	4
10	Chemical bonding: ionic, covalent, orbit structure	4
11	Gas laws: Boyle's law, Charles' law, STP, Kelvin conversion	4
12	Fluids: upthrust, hydraulic machines, relative density	4

Counted across the official previous-year question papers we have analysed for this subject. It shows what has been asked before — it does not predict what will appear in your exam. Always confirm the current syllabus on the official portal.

What you will study (chapters)

Chapter 1: Measurements and Experimentation
Chapter 2: Motion in One Dimension
Chapter 3: Laws of Motion
Chapter 4: Fluids
Chapter 5: Heat and Energy
Chapter 6: Light
Chapter 7: Sound
Chapter 8: Electricity and Magnetism
Chapter 9: The Language of Chemistry
Chapter 10: Chemical Changes and Reactions
Chapter 11: Water
Chapter 12: Atomic Structure and Chemical Bonding
Chapter 13: The Periodic Table
Chapter 14: Study of the First Element - Hydrogen
Chapter 15: Study of Gas Laws
Chapter 16: Atmospheric and Environmental Chemistry
Chapter 17: Basic Biology
Chapter 18: Flowering Plants
Chapter 19: Plant Physiology
Chapter 20: Diversity in Animal Kingdom
Chapter 21: Economic Importance of Bacteria and Fungi
Chapter 22: Human Anatomy and Physiology
Chapter 23: Health and Hygiene

How to study Science (Physics, Chemistry And Biology) and score well

Start with the highest-frequency topics — In Science (Physics, Chemistry And Biology), Diagram-based questions in Biology, Chemical equations, balancing, and reaction classification, Human anatomy: digestion, respiration, skeleton, skin, neuron, and Atomic structure, electronic configuration, isotopes, valency appear again and again in past papers. Master these first — they return the most marks for the time you put in.
Practise with previous-year papers — Solve the last 5–10 years of ICSE & ISC Science (Physics, Chemistry And Biology) papers under timed, exam-like conditions. Past papers show exactly which topics repeat and how questions are worded.
Revise actively, not passively — Write a one-page summary for each of the 23 chapters — key definitions, formulas and the points examiners reward — then re-test yourself instead of re-reading.
Mark your answers with the official scheme — After each practice paper, score yourself against the official marking scheme. It shows how marks are awarded step-by-step, so you learn to present answers the way examiners expect.

Exam tips: how to score higher in Science (Physics, Chemistry And Biology)

Where students lose marks: rushing the high-weightage questions, skipping the steps the marking scheme rewards, and saving easy sections for last. Read the whole paper first, attempt your strongest section early to bank marks, and always show your working.

Manage your time: split your time in proportion to the marks each section carries, keep a few minutes at the end to check, and never leave a question blank — a partial, structured answer still earns partial marks.

Frequently asked questions

What are the most important topics in Science (Physics, Chemistry And Biology)?

Based on past papers, the most frequently asked topics include Diagram-based questions in Biology, Chemical equations, balancing, and reaction classification, Human anatomy: digestion, respiration, skeleton, skin, neuron. The full ranked list with how often each appears is in the "Most important topics" section above.

Where can I download Science (Physics, Chemistry And Biology) previous-year question papers?

Official ICSE & ISC previous-year question papers are available on the official ICSE & ISC website. Open the Question Papers section for the direct link, plus the exam pattern and the topics that repeat most.

How can I prepare for Science (Physics, Chemistry And Biology) faster?

Start with the highest-frequency topics, learn the exam pattern so you know how each section is marked, and practise with past papers. A subject-aware study tutor can quiz you on exactly these topics.

A Gyani AI tutor trained on the Science (Physics, Chemistry And Biology) syllabus and past papers can quiz you on the most-asked topics and show you exactly what to revise.