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Mid-term papers are set from roughly the first half of the syllabus, so a small group of chapters carries most of the marks — in most subjects about five chapters account for close to 40% of the paper. For Class 10 Science those are Chemical Reactions and Equations, Acids Bases and Salts, Metals and Non-metals, Life Processes and Light. For Class 10 Maths: Real Numbers, Polynomials, Pair of Linear Equations, Quadratic Equations and Triangles. Revise those first, ranked by weightage against your own confidence — then widen.
Last updated: 13 September 2026
Why does a handful of chapters carry so much of the paper?
Two reasons, and neither is an accident.
First, mid-terms are drawn from about the first half of the year’s syllabus, so the pool is already small. Second, boards weight papers by unit, not by chapter, and the heavy units tend to sit early in the book. In Class 10 Maths, Algebra alone is 20 of the 80 board marks and its four chapters all fall in the first half — the arithmetic does the rest.
The result is a paper where a small set of chapters decides your grade, while most students spread revision evenly across everything and never notice. You can see the full board-level picture in our Class 10 Maths chapter weightage breakdown for 2026-27.
Which chapters, subject by subject?
Each chapter below links to the full lesson, so you can start on the heaviest one the moment you have ranked yourself.
| Class & subject | The five that usually carry the most |
|---|---|
| Class 10 Maths |
Real Numbers · Polynomials · Pair of Linear Equations · Quadratic Equations · Triangles |
| Class 10 Science |
Chemical Reactions and Equations · Acids, Bases and Salts · Metals and Non-metals · Life Processes · Light — Reflection and Refraction |
| Class 9 Science NCF-SE “Exploration” book |
Cell: The Building Block of Life · Describing Motion Around Us · Exploring Mixtures and their Separation · How Forces Affect Motion · Journey Inside the Atom |
| Class 12 Physics |
Electric Charges and Fields · Electrostatic Potential and Capacitance · Current Electricity · Moving Charges and Magnetism · Electromagnetic Induction |
| Class 12 Chemistry |
Solutions · Electrochemistry · Chemical Kinetics · The d- and f-Block Elements · Coordination Compounds |
A note on Class 9 Science. The book changed. Under the NCF-SE “Exploration” curriculum the old chapter names — Matter in Our Surroundings, Atoms and Molecules, The Fundamental Unit of Life — have been reorganised into the chapters listed above. If a revision list you find online still uses the old names, it predates the current book.
Free live masterclass · Sunday 20 September, 11:00 AM. “The 5 Chapters That Decide Your Mid-Term Marks” — the weightage map for Class 9–12, a live Score Map on a real student’s subject, and a 7-day revision plan built on screen. Free, and recorded for everyone who registers.
How reliable is the “40%” figure?
Honestly: it is a good working estimate, not a published number. Mid-terms are set by your school, not by CBSE, so nobody publishes a mid-term blueprint. What exists is the board unit-wise weightage, and most schools model their papers on the board pattern — which is why it is the best available proxy.
Where it comes from, for Class 10 Maths: Algebra is 20 board marks and Geometry 15. The four Algebra chapters and Triangles all sit in the first half of the book, so a mid-term drawn from that half is heavily loaded toward them. Run the same logic in your subject and you will land near the same answer.
Treat 40% as a reason to rank your chapters, not as a number to quote.
What order should you revise them in?
Not the order they appear in the book. Sort by two things: the marks a chapter carries, and your own confidence out of ten. Start where those two disagree most.
| Chapter is… | What to do | Time share |
|---|---|---|
| Heavy and weak | Start here, always. This is where marks are actually sitting. | ~60% |
| Heavy and strong | A quick recall pass to protect marks you already have. | ~20% |
| Light and weak | Only if time remains after the two rows above. | ~20% |
| Light and strong | Leave it alone. | 0% |
That single re-ordering is usually worth more than an extra week of study, because it moves your effort onto the marks that are in play.
How long should each chapter take?
Twenty-five minutes, not two hours. The structure matters more than the duration:
| Minutes | What you do | Why |
|---|---|---|
| 8 | Write everything you remember about the chapter on a blank page | Forces recall, which is what the exam tests |
| 10 | Correct that page against the book, in a different colour | Shows you exactly what was missing |
| 7 | Answer ten questions on the chapter | Converts recognition into production |
If you score below seven out of ten, the chapter goes back on tomorrow’s list however long you spent on it today. Three chapters an evening, done this way, beats a whole evening of re-reading — because in the exam you have to produce the material, not recognise it.
What if you are behind on all of them?
Then the ranking matters more, not less. Pick the two heaviest chapters and finish them properly rather than touching five and finishing none. A student who walks in solid on Quadratic Equations and Triangles scores better than one who has skimmed everything and can complete nothing.
How do you know which chapters are actually weak?
Most students guess, and most guess wrong — the chapter that feels hardest is often not the one losing marks. A short chapter-tagged diagnostic answers it in fifteen minutes: twenty questions across five chapters, then a map showing which are green, amber and red.
It will not predict your exact mark, and it does not pretend to. What it gives you is the ranking to revise by. If you want to understand how that kind of tool helps and where it does not, we wrote an honest answer in what an AI tutor actually does.
Frequently asked questions
Are mid-term papers set from the whole syllabus?
Usually from about the first half. Your school circulates the exact portion — work from that, not from a general list.
Do the same five chapters apply to every subject?
No. The five differ by subject and class; the table above lists them for Class 10 Maths and Science, Class 9 Science and Class 12 Physics and Chemistry.
Is the 40% figure official?
No. CBSE publishes unit-wise weightage for board papers; mid-terms are set by schools. Forty per cent is an estimate derived from board weightage, which most schools follow.
How many chapters should I revise in a day?
Three, at roughly 25 focused minutes each, is sustainable for about five days before quality drops.
Should I do sample papers or revise chapters first?
Chapters first, then one timed paper per subject. A paper attempted before revision mostly measures what you already knew.
Does chapter weightage apply to school mid-terms or only boards?
Board weightage is the best available guide for mid-terms too, because most schools model their papers on the board pattern.
What if my school’s portion excludes one of these chapters?
Drop it and move the next-heaviest chapter into the five. The ranking method does not change.
My Class 9 chapter names do not match this list. Why?
Class 9 Science moved to the NCF-SE “Exploration” book, which reorganised and renamed the chapters. The list above follows the current book.
Find your five in fifteen minutes. The free Score Map tests you chapter by chapter and returns the three chapters that will move your marks the most. No card needed.