Primary 3 Science exam paper analysis and topic trends
PaperLah has 446 Primary 3 Science exam papers from 27 Singapore primary schools, set between 2011 and 2025, with 18,184 questions in total. The topics carrying the most marks are Classification (27%), Materials (17%) and Magnets (11%); together the top 3 topics account for half of all marks. Classification appears in 95% of the papers. Multiple-choice questions make up 55% of marks, and 0.8% of questions are worth 3 marks or more, which usually means showing working. A typical paper has about 41 questions and 55 marks.
These figures describe the school papers in PaperLah's collection, not official MOE or SEAB weightings. They help with planning revision; they can't predict a particular exam.
Where the marks are
Topics ranked by their share of all marks. The blue ones above the line together make up half.
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| Topic | % of marks | Papers |
|---|---|---|
| Classification | 26.5 | in 423 of 446 papers |
| Materials | 17.3 | in 351 of 446 papers |
| Magnets | 10.7 | in 194 of 446 papers |
| Living and non-living things | 9.9 | in 397 of 446 papers |
| Plant parts and transport | 8.4 | in 349 of 446 papers |
| Life cycles | 6 | in 243 of 446 papers |
| Fungi and bacteria | 5.6 | in 315 of 446 papers |
| Digestive system | 3.9 | in 140 of 446 papers |
| Human body systems | 3 | in 167 of 446 papers |
| Scientific investigation | 2 | in 186 of 446 papers |
| Plant reproduction | 1.9 | in 187 of 446 papers |
| Electricity | 1.1 | in 116 of 446 papers |
| Adaptations | 0.9 | in 116 of 446 papers |
| Reproduction in humans and animals | 0.7 | in 123 of 446 papers |
| Light | 0.6 | in 77 of 446 papers |
| Respiratory and circulatory systems | 0.4 | in 50 of 446 papers |
| Environment and ecosystems | 0.3 | in 33 of 446 papers |
| Forces | 0.1 | in 19 of 446 papers |
| Photosynthesis | 0.1 | in 17 of 446 papers |
| Heat | 0.1 | in 8 of 446 papers |
| Matter | 0.1 | in 10 of 446 papers |
| Animal preferences | 0 | in 2 of 446 papers |
| Cycles | 0 | in 2 of 446 papers |
| Animal physical characteristics | 0 | in 2 of 446 papers |
| Animal skeletons | 0 | in 2 of 446 papers |
| Shapes and their properties | 0 | in 1 of 446 papers |
| Cells | 0 | in 2 of 446 papers |
| Changes of state and water cycle | 0 | in 2 of 446 papers |
| Comparing things | 0 | in 1 of 446 papers |
| Animal feeding | 0 | in 2 of 446 papers |
What a paper is made of
How children answer, as a share of marks.
- Multiple choice 55%
- Open-ended (show working) 21%
- Short answer 16%
- Fill in the blank 3%
- Other 5%
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| Format | % of marks |
|---|---|
| Multiple choice | 55.1 |
| Open-ended (show working) | 21 |
| Short answer | 15.9 |
| Fill in the blank | 3.4 |
| Word bank | 2 |
| Drawing or labelling | 1.5 |
| Other | 0.6 |
| Number answer | 0.4 |
| Rewrite / synthesis | 0 |
| Cloze passage | 0 |
Marks per question
Share of questions worth 1, 2, 3, 4 or 5+ marks. 7% have no marks printed. Higher-mark questions usually need working.
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| Marks | % of questions |
|---|---|
| 1 | 49 |
| 2 | 43.5 |
| 3 | 0.6 |
| 4 | 0.2 |
How topics change over the years
The most-asked topics, as a share of each year's questions. Darker means asked more that year. Use it to spot topics schools are asking more often now.
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| Topic | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
|---|---|---|---|---|---|---|---|---|
| Classification | 29.8 | 24.3 | 20.3 | 26 | 25.1 | 21.5 | 25.2 | 22 |
| Materials | 14.6 | 15.6 | 15 | 16.7 | 16.6 | 16 | 18 | 20 |
| Magnets | 8.9 | 10.9 | 12.2 | 14.2 | 15.5 | 15.9 | 14.2 | 15.6 |
| Living and non-living things | 10.1 | 9.8 | 7.2 | 9.4 | 7.8 | 9.7 | 7.4 | 8.5 |
| Life cycles | 4.3 | 6.1 | 7.4 | 1.3 | 4.3 | 12.9 | 11.7 | 16.3 |
| Plant parts and transport | 9.5 | 10 | 10.5 | 6.4 | 7.8 | 5 | 4.4 | 1.8 |
| Fungi and bacteria | 6.5 | 6.1 | 5.4 | 7.2 | 5.7 | 5.3 | 6.6 | 4.5 |
| Digestive system | 4.7 | 5.7 | 6.6 | 7.9 | 6 | 2.6 | 2.6 | 0 |
| Human body systems | 3.4 | 2.9 | 5.6 | 3.8 | 4.3 | 1.9 | 1.2 | 0.1 |
| Scientific investigation | 1.4 | 2.3 | 2.5 | 1.7 | 1.3 | 2.7 | 3 | 3.5 |
How likely a topic comes up
The share of papers with at least one question on the topic.
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| Topic | % of papers |
|---|---|
| Classification | 94.8 |
| Living and non-living things | 89 |
| Materials | 78.7 |
| Plant parts and transport | 78.3 |
| Fungi and bacteria | 70.6 |
| Life cycles | 54.5 |
| Magnets | 43.5 |
| Plant reproduction | 41.9 |
| Scientific investigation | 41.7 |
| Human body systems | 37.4 |
| Digestive system | 31.4 |
| Reproduction in humans and animals | 27.6 |
| Electricity | 26 |
| Adaptations | 26 |
| Light | 17.3 |
| Respiratory and circulatory systems | 11.2 |
| Environment and ecosystems | 7.4 |
| Forces | 4.3 |
| Photosynthesis | 3.8 |
| Matter | 2.2 |
| Heat | 1.8 |
| Animal preferences | 0.4 |
| Cycles | 0.4 |
| Animal feeding | 0.4 |
| Animal physical characteristics | 0.4 |
| Animal skeletons | 0.4 |
| Cells | 0.4 |
| Changes of state and water cycle | 0.4 |
| Shapes and their properties | 0.2 |
| Comparing things | 0.2 |
Exam types
Which school exams these papers come from.
Key facts
- 446 papers, 18,184 questions, 24,724 marks, from 27 schools.
- 3 topics carry half of all marks.
- Most-tested topic: Classification, 27% of marks.
- Most common topic across papers: Classification, in 95% of papers.
- 0.8% of questions are worth 3 marks or more.
- Exam types: End-of-Year / SA2, Mid-Year / SA1, Weighted Assessment / CA, Quiz / Review / Test, Practice paper and Other.
Questions parents ask
What topics come up most in Primary 3 Science exam papers?
By share of marks, the most-tested topics are Classification (27%), Materials (17%), Magnets (11%), Living and non-living things (9.9%) and Plant parts and transport (8.4%).
How many questions and marks are in a Primary 3 Science paper?
A typical paper in this set has about 41 questions and 55 marks. Papers vary by school and by exam (weighted assessments are shorter than mid-year and end-of-year exams).
Which exams and schools are included?
446 papers from 27 schools, from these exam types: End-of-Year / SA2, Mid-Year / SA1, Weighted Assessment / CA, Quiz / Review / Test, Practice paper and Other. The schools are listed further down this page.
Can I download these papers?
No. PaperLah doesn't share the papers as downloads. Children practise them online one question at a time, with instant marking, and parents see which topics need work.
Schools included
ACS (Junior) · ACS (Primary) · Ai Tong · Anglo-Chinese School · CHIJ · CHIJ St Nicholas Girls' · Catholic High · Henry Park · Maha Bodhi · Maris Stella High · Methodist Girls' · Nan Hua · Nanyang · Northland · Paya Lebar Methodist Girls' · Pei Chun · Pei Hwa · Raffles Girls' · Red Swastika · River Valley · Rosyth · Rulang · Singapore Chinese Girls' · St Hilda's · Tao Nan · Temasek · Yang Zheng
Papers are past school assessments; PaperLah is not affiliated with MOE, SEAB or the schools.
How this analysis is made
Every question in each paper is tagged with its topic, format and marks as printed. The figures above are counts over those questions: a topic's share of marks, the share of papers that include it, and so on. Topic names come from the papers and their answer keys, so similar topics can appear under slightly different names. Only aggregate figures are shown here; the questions themselves are practised inside PaperLah.
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