If you’re in Class 10, you’ve probably felt it: Science is a huge subject. Physics, Chemistry and Biology are all packed into one paper, and every teacher says “just read NCERT” without telling you how. Revise full science in 14 Days with Myclass24 course.
This guide breaks it down properly. You’ll see which chapters carry the most marks, which ones are tricky, how to split your revision time, and the small habits that separate a 92 from a 100.
First, understand the paper
The Science theory paper is 80 marks, and 20 marks come from internal assessment and practicals. You get these 20 almost for free if you take practicals seriously, so don’t ignore them.
The theory paper roughly follows this structure:
Section A: 20 questions of 1 mark each (MCQs and assertion-reason)
Section B: 6 questions of 2 marks each
Section C: 7 questions of 3 marks each
Section D: 3 long answers of 5 marks each
Section E: 3 case-based questions of 4 marks each
A big share of the paper tests application and reasoning, not just recall. The pattern can shift slightly each year, so check this year’s sample paper on the CBSE website.
Unit-wise marks: where the marks are
Unit | Subject area | Marks |
|---|---|---|
I. Chemical Substances | Chemistry (Ch 1–4) | 25 |
II. World of Living | Biology (Ch 5–8) | 25 |
III. Natural Phenomena | Physics: Light, Eye (Ch 9–10) | 12 |
IV. Effects of Current | Physics: Electricity, Magnetism (Ch 11–12) | 13 |
V. Natural Resources | Our Environment (Ch 13) | 5 |
Chemistry and Biology together make up 50 of 80 marks. That’s over 60% of the paper. If you’re weak in either, fix it first.
Chapter-wise difficulty and importance
Ch | Chapter | Difficulty | Importance | What to focus on |
|---|---|---|---|---|
1 | Chemical Reactions and Equations | Easy–Medium | ⭐⭐⭐⭐⭐ | Balancing equations, types of reactions, corrosion and rancidity |
2 | Acids, Bases and Salts | Medium | ⭐⭐⭐⭐⭐ | pH, preparation and uses of salts, chemical equations |
3 | Metals and Non-metals | Medium | ⭐⭐⭐⭐ | Reactivity series, extraction of metals, ionic bonding |
4 | Carbon and its Compounds | Medium–Hard | ⭐⭐⭐⭐⭐ | Nomenclature, functional groups, soaps, ethanol and ethanoic acid reactions |
5 | Life Processes | Medium–Hard | ⭐⭐⭐⭐⭐ | Nutrition, respiration, transport, excretion, labelled diagrams |
6 | Control and Coordination | Medium | ⭐⭐⭐⭐ | Neuron, reflex arc, brain, plant hormones |
7 | How do Organisms Reproduce? | Medium | ⭐⭐⭐⭐ | Flower structure, human reproductive system, fission vs budding |
8 | Heredity | Medium–Hard | ⭐⭐⭐⭐⭐ | Mendel’s crosses, sex determination, trait inheritance |
9 | Light: Reflection and Refraction | Hard | ⭐⭐⭐⭐⭐ | Ray diagrams, mirror and lens formula, sign convention |
10 | The Human Eye and the Colourful World | Easy–Medium | ⭐⭐⭐⭐ | Defects and correction, scattering, dispersion |
11 | Electricity | Hard | ⭐⭐⭐⭐⭐ | Ohm’s law, series and parallel circuits, power and energy numericals |
12 | Magnetic Effects of Electric Current | Medium | ⭐⭐⭐⭐ | Right-hand rules, solenoid, motor, generator |
13 | Our Environment | Easy | ⭐⭐⭐ | Food chains, ozone depletion, waste, with quick and safe marks |
Chapter ratings are indicative, so adjust them to your own strengths.
The pattern to notice: the “hard” chapters (Light, Electricity, Carbon, Heredity) are also the high-yield ones. Don’t avoid them. Students who master these usually separate themselves from the rest.
A 90-day revision plan
Start earlier if you can. If you have less time, compress the phases but keep the same order.
Phase 1: Foundation (Days 1–45)
Go chapter by chapter, NCERT first. Read the text, understand the logic, and solve every in-text and back-exercise question yourself. Don’t just read the solutions.
A workable daily split is about 2 hours for one major topic, 45 minutes of notes or flashcards, and 30 minutes of previous-year questions on that topic.
A good order is Chemistry (Ch 1–4), then Biology (Ch 5–8), then Physics (Ch 9–12), with Ch 13 slotted in as a lighter break. Interleave subjects weekly if one starts to feel heavy.
Phase 2: Practice (Days 46–70)
Now shift from reading to testing yourself.
Solve previous-year papers and the official CBSE sample papers
Do the NCERT Exemplar for harder application questions
Practise case-based questions and assertion-reason questions. They are scoring but trick you if you’re careless
Maintain an error notebook (more on that below)
Phase 3: Revision and polish (Days 71–90)
Revise only from your short notes and error notebook
Attempt 1 full paper every 2 days, timed, 3 hours
Redraw every diagram until it takes under 2 minutes
Re-read all NCERT summaries and boxed definitions
The last 2 days: light revision, good sleep, no new topics
Subject-wise strategies that actually work
Chemistry: practise on paper
Write every equation balanced, with state symbols where required. Examiners deduct for unbalanced equations
Keep a one-page sheet of the reactivity series, functional groups and reactions of carbon compounds, and revise it daily
For Acids, Bases and Salts, learn the why behind pH changes. Case-based questions love this
Biology: diagrams and keywords
Biology is a keyword subject. Examiners look for specific terms like “peristalsis” or “glomerular filtration”
Practise labelled diagrams: human heart, nephron, reflex arc, neuron, flower, human digestive and reproductive systems
For Heredity, solve at least 15 cross problems until the punnett squares feel automatic
Physics: formulas, units and diagrams
Write given → formula → substitution → answer with unit. This earns step marks even if the final number slips
Learn the sign convention for mirrors and lenses before you attempt numericals
Draw ray diagrams with a ruler, arrows on rays, and proper labels
For Electricity, practise 5 numericals daily on series/parallel combinations and power
How to score full marks: the real tips
1. Treat NCERT as your bible. Most direct questions come from NCERT lines, examples and diagrams. If you know NCERT cold, you’ve already secured the base of a 90+.
2. Keep an error notebook. Every time you lose marks, write the question, your mistake, and the right answer. Revisit this notebook before every mock test. Most students repeat the same mistakes, so this alone can add 5–8 marks.
3. Write answers to the marks. A 2-mark answer needs two clear points. A 3-mark answer needs three. A 5-mark answer needs a proper structure, with a diagram if relevant. Don’t write a paragraph where two lines will do.
4. Underline keywords. Use a pencil or pen to underline key scientific terms in your long answers. It helps the examiner find marks quickly.
5. Never leave diagrams for the end. Draw them neatly and label with a straight line (a ruler helps). A clean diagram can fetch full marks on its own.
6. Don’t skip practicals. The 20 internal marks and the practical-based questions in the paper reward students who actually did the experiments. Revise the list of required experiments and their observations.
7. Take timed mocks. Writing speed is a real skill. Practise finishing the paper with 15 minutes to review.
8. Read the question twice. Many marks are lost on “write balanced equation” versus “write equation”, or “state” versus “explain”. Underline the command word.
9. Sleep and consistency beat all-nighters. Studying 4 focused hours daily for three months beats 12 panicked hours in the last week.
Common mistakes to avoid
Memorising answers without understanding concepts
Ignoring Physics numericals because “they’re scary”
Skipping NCERT intext questions
Studying only from guides or video lectures and never writing answers
Leaving Chapter 13 for the last day (it’s easy, so don’t waste marks there)
Not revising what you studied in Phase 1
Final word
You don’t need to be a genius to score well in Class 10 Science. You need a plan, NCERT in your head, and enough practice that nothing in the paper feels new. Start today, trust the process, and keep your error notebook close.
Full marks are possible. Thousands of students achieve it every year, and with consistent work, you can too.
Good luck, and drop your toughest chapter in the comments. We’ll cover it next.