CBSE Class 10 · Science

CBSE Class 10 Science Board Exam Preparation

Physics, Chemistry and Biology — one complete board strategy

Complete chapter-wise preparation guide for CBSE Class 10 Science board exam. Unit-wise marks, important diagrams, key reactions, and study strategy for all three sections.

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80

Theory Marks

20

Practical Marks

3 hours

Exam Duration

13

Total Chapters

Chapter-Wise Marks Breakdown

82 theory marks
ChapterMarksDifficulty
Chemical Reactions & Equations6Easy
Acids, Bases & Salts6Easy
Metals & Non-metals6Medium
Carbon & Its Compounds6Medium
Life Processes10Hard
Control & Coordination7Medium
Reproduction8Medium
Heredity & Evolution5Medium
Light — Reflection & Refraction7Easy
Human Eye & Colourful World5Easy
Electricity7Medium
Magnetic Effects of Current5Easy
Our Environment & Management4Easy

Topics That Appear Every Year

01Life Processes diagrams — Human heart, nephron, digestive system, respiratory system
02Reflex arc diagram — every year
03Human reproductive system — male and female
04Mirror formula and lens formula with ray diagrams
05Electricity — series/parallel circuit numericals
06Balancing chemical equations — all types
07Reactivity series — order and reactions
08Mendel's cross — monohybrid and dihybrid

Study Strategy for 90+

1

Split Science into 3 parts: Physics (Light, Electricity, Magnetic Effects), Chemistry (Chapters 1–4), Biology (Chapters 5–8). Each section needs a different study approach

2

Biology = diagrams. Every important process has a diagram. Draw and label from memory daily. Diagrams carry 30–40% of Biology marks

3

Chemistry = reactions and equations. Balance every equation you study. CBSE gives 1 mark per correctly balanced equation

4

Physics = numericals + ray diagrams. Practice mirror and lens problems with all 3 cases: real/virtual, magnified/diminished

5

Mock papers reveal which section is weakest. Upload for AI evaluation to catch diagram labelling mistakes before the exam

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ClearSteps gives you CBSE Class 10 Science mock papers, concept videos for every chapter, and AI evaluation against the real CBSE marking scheme.