Free revision notes
Free revision notes for PSLE, O-Level and A-Level
Free notes for 9 subjects, 80 chapters in all, readable on the page and ready to print. Each chapter gives the key idea, the facts and formulas to know, the common mistakes and exam tips, in syllabus order. The O-Level notes also cover the SEC G3 syllabus that replaces the O-Level from 2027.
PSLE notes
PSLE notes- PSLE Maths notes12 chapters · Primary 5 and 6Fractions, Decimals, Percentage, Ratio and more
- PSLE Science notes8 chapters · Primary 5 and 6Life Cycles of Plants and Animals, Plant Transport and Photosynthesis, Human Body Systems, Electrical Circuits and more
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O-Level and SEC notes
O-Level and SEC notes- O-Level E-Math notes12 chapters · Secondary 3 and 4Quadratic Equations, Simultaneous Equations, Algebraic Expressions and Formulae, Indices and Standard Form and more
- O-Level A-Math notes10 chapters · Secondary 3 and 4Quadratic Functions and Inequalities, Surds, Polynomials and Partial Fractions, Binomial Theorem and more
- O-Level Physics notes10 chapters · Secondary 3 and 4Kinematics, Dynamics and Newton's Laws, Turning Effect of Forces, Pressure and more
- O-Level Chemistry notes10 chapters · Secondary 3 and 4Mole Concept and Stoichiometry, Chemical Bonding, Acids and Bases, Salts and Their Preparation and more
- O-Level Biology notes8 chapters · Secondary 3 and 4Cell Structure and Organisation, Movement of Substances, Biological Molecules and Enzymes, Nutrition in Humans and more
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A-Level notes
A-Level notes- H2 Math notes5 chapters · JC 1 and 2Functions, Sequences and Series, Vectors: Lines and Planes, Complex Numbers and more
- H2 Chemistry notes5 chapters · JC 1 and 2Chemical Equilibria, Acid and Base Equilibria, Chemical Energetics, Reaction Kinetics and more
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Which notes do you need?
| If you search for | Open these notes |
|---|---|
| PSLE notes | PSLE Maths and PSLE Science |
| O-Level or SEC notes | E-Math, A-Math, Physics, Chemistry and Biology |
| O-Level QA notes | O-Level Chemistry qualitative analysis notes, every test in one table |
| A-Level or JC notes | H2 Math and H2 Chemistry |
| Formula lists | Free formula sheets, with what each exam prints and what you must memorise |
What each notes page covers
Every page lists the whole syllabus and the exam format. Chapters with full notes have a worked exam question. The rest have a checklist of what the syllabus asks for.
| Notes | Syllabus chapters | Full notes | Exam papers |
|---|---|---|---|
| O-Level E-Math | 18 | 12 | 2 |
| O-Level A-Math | 10 | 10 | 2 |
| O-Level Physics | 20 | 10 | 3 |
| O-Level Chemistry | 12 | 10 | 3 |
| O-Level Biology | 14 | 14 | 3 |
| PSLE Maths | 14 | 12 | 2 |
| PSLE Science | 18 | 8 | 1 |
| H2 Math | 17 | 5 | 2 |
| H2 Chemistry | 14 | 5 | 4 |
How to revise with notes
- Read one chapter, then close the page and write down the key idea and the must-know points from memory.
- Check what you wrote against the notes and mark what you missed.
- Read the common mistakes for that chapter before you do any questions.
- Do questions on that chapter from a free school test paper, then mark them.
- A few days later, redo the questions you got wrong without looking at the notes.
Questions students ask
Are these notes free?
Yes. Every notes page is free to read and print, with no sign-up. Use your browser's print button to save a page as a PDF.
Which subjects have notes?
PSLE Maths and Science, O-Level and SEC E-Math, A-Math, Physics, Chemistry and Biology, and A-Level H2 Math and H2 Chemistry. More subjects are added as their topic guides are written.
Are the notes for the 2027 SEC?
Yes. The O-Level notes follow the 2026 O-Level syllabus and the SEC G3 syllabus that replaces it from 2027. SEAB lists each SEC G3 syllabus against the O-Level code it replaces, for example K325 for Biology 6093.
Who writes the notes?
They are TSS's own revision notes, condensed from our topic guides and checked against the SEAB or MOE syllabus named on each page. They are not issued by MOE or SEAB.
How are the notes laid out?
Each page opens with the exam format and the whole syllabus as a chapter list. Chapters with full notes give the key idea, the facts and formulas to know, a summary table, a worked exam question, the common mistakes and exam tips. The other chapters have a checklist of what the syllabus asks for.
Do you have Geography, History or H2 Economics notes?
Not yet. We only publish notes for subjects that have TSS topic guides, and those subjects do not have them yet.
How should I use revision notes?
Read one chapter, close the page and write down what you remember, then check. Then do questions on that chapter from a school paper. Reading notes alone is the weakest way to revise.
Are there N-Level notes?
There are no separate N-Level notes. From 2027 there is no N-Level exam, as Secondary 4 students sit the SEC with subjects at G1, G2 or G3. G3 keeps the O-Level standard.