Cambridge IGCSE · 分析與預測
2025 Cambridge IGCSE Sciences - Co-ordinated (Double) (0654) Past Paper 分析與預測
An overview of the May/June 2025 series of the Cambridge IGCSE Co-ordinated Sciences (Double) (0654) examinations, highlighting key testing areas in biology, chemistry, and physics, along with examiner insights on core conceptual hurdles.
更新: 2026年6月13日
難度 3.4/5
總分
220
時間
255 分鐘
最高頻課題
—
分卷
卷二 選擇題 (Extended): 40 分 · 45 分鐘Paper 4 Theory (Extended): 120 分 · 120 分鐘Paper 6 Alternative to Practical: 60 分 · 90 分鐘
考官重點
官方報告整理常見失分位
- Misunderstanding the direction of water potential gradient in root hair cells, often writing that salt moves rather than water by osmosis.
- Struggling to balance ionic half-equations at the cathode, particularly omitting state symbols or incorrect charge signs on electrons.
- Confusing step-up and step-down transformer coil ratio calculations, leading to inverted voltage values.
常見誤解
- Believing that the temperature of an endothermic reaction mixture increases due to 'taking in' heat from the surroundings.
- Confusing addition polymerisation (producing only polymer) with condensation polymerisation (producing polymer and a small molecule like water).
- Assuming that a real image can be formed by a plane mirror.
失分原因
- Failing to convert mass from grams to kilograms when calculating gravitational potential energy using \( E_p = mgh \).
- Vague explanations of convection in stars, missing the link between density changes and rising/sinking gas.
- Incomplete definitions of an isotope, omitting that they must have the same number of protons (or be atoms of the same element).
等級 cut-off 估算
更新: 2026年6月13日
| 等級 | 分數 | 百分比 |
|---|---|---|
| A* | 170/240 | 71% |
| A | 144/240 | 60% |
| B | 118/240 | 49% |
| C | 93/240 | 39% |
| D | 80/240 | 33% |
| E | 67/240 | 28% |
Official grade boundaries published by Cambridge IGCSE grade thresholds (official).
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