Sec 3 and Sec 4 · 22 papers
O-Level Pure Biology prelim papers, free with answers
22 Biology papers set by 13 Singapore secondary schools in 2024: 22 for Sec 4. 22 are Sec 4 prelim exams, and 22 come with answers. They prepare for O-Level Biology (6093) in 2026 and SEC G3 Biology (K325) from 2027.
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Sec 4 Biology papers
Prelim exams 22
Assumption English
Christ Church Paper 2
Christ Church Paper 1
Dunman Paper 1
Dunman Paper 2
Fuhua Paper 1
Fuhua Paper 2
Jurongville Paper 1
Jurongville Paper 2
Mayflower Paper 1
Mayflower Paper 2
St Gabriel's
Tanjong Katong Girls' Paper 1
Tanjong Katong Girls' Paper 2
Yio Chu Kang Paper 1
Yio Chu Kang Paper 2
Yishun Town Paper 2
Yishun Town Paper 1
Yuying
Nan Chiau High Paper 1
Nan Chiau High Paper 2
Bendemeer
The Biology exam these papers prepare for
The papers were set for O-Level Biology (6093) in 2026 and SEC G3 Biology (K325) from 2027. SEAB's scheme of assessment is the same for both years:
| Paper | Type | Time | Marks | Weighting |
|---|---|---|---|---|
| Paper 1 | Multiple choice, 40 questions | 1 h | 40 | 30% |
| Paper 2 | Structured and free response | 1 h 45 min | 80 | 50% |
| Paper 3 | Practical | 1 h 50 min | 40 | 20% |
In Paper 2, Section A carries 70 marks of structured questions, ending with one free-response and one data-based question worth 20 marks together. Section B carries 10 marks: answer one of two free-response questions.
Source: SEAB, O-Level Biology 6093 (2026) and SEAB, SEC G3 Biology K325 (2027).
Which topics do these papers test most?
Counted from the topics listed on each paper's page: how many papers test each topic. A topic that shows up in most papers is worth revising first.
| Topic | Papers |
|---|---|
| Coordination, homeostasis and excretion | 22 of 22 |
| Infectious diseases | 22 of 22 |
| Inheritance and variation | 22 of 22 |
| Organisms and the environment | 22 of 22 |
| Nutrition in plants | 21 of 22 |
| Reproduction | 21 of 22 |
| Biological molecules and enzymes | 20 of 22 |
| Transport in humans | 19 of 22 |
| Molecular genetics and biotechnology | 19 of 22 |
| Nutrition in humans | 18 of 22 |
| Transport in flowering plants | 17 of 22 |
| Respiration | 17 of 22 |
Linked topics have a free study guide with a worked example and practice questions.
How to use Biology papers well
- Answer with the syllabus wordsUse the exact terms the syllabus uses, such as water potential or active site, rather than a correct idea in loose words.
- Practise reading dataThe data-based question gives an experiment you have not seen. Describe the trend with figures before you explain it.
- Use the MCQ paper to find gapsPaper 1 covers the whole syllabus in 40 questions, so a marked MCQ paper shows which topics to revise first.
Questions about these papers
Are these Biology papers still good practice for the 2027 SEC?
Yes. The final O-Level is in October and November 2026, and from 2027 Sec 4 students sit the Singapore-Cambridge Secondary Education Certificate (SEC). SEAB's 2027 G3 syllabus sets the same papers, marks and timings as the 2026 O-Level syllabus, so school papers set for the O-Level are close practice for G3. Check any topic you are unsure of against the current syllabus.
Do the Biology papers come with answers?
22 of the 22 come with answers, as a separate PDF so the paper can be tried first. 22 of those are the school's own answer key, and the rest were typed by an unofficial source, which the paper's page says because we have not checked them.
Are the papers free?
Yes. Enter your email and mobile once, and every paper on this site then downloads straight away on that device.