Cambridge IGCSE · 分析與預測
2023 Cambridge IGCSE Sciences - Co-ordinated (Double) (0654) Past Paper 分析與預測
The May/June 2023 series for Cambridge IGCSE Co-ordinated Sciences (0654) showcased a standard distribution of marks across Biology, Chemistry, and Physics. While candidate recall of fundamental concepts was solid, significant hurdles remained in the precise application of kinetic theory, quantitative conversions, and the articulation of specific physical mechanisms such as vasodilation and wave characteristics.
更新: 2026年6月13日
難度 3.5/5
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
- Failing to convert metric units before substituting values into calculations, particularly with moments (using cm instead of m) and wave equations (using MHz instead of Hz).
- Using general, non-scientific terminology instead of specific required vocabulary (such as writing 'blood vessels expand' instead of 'arterioles dilate' for vasodilation).
- Omitting the production of water in the description of condensation polymerisation of nylon from dicarboxylic acid and diamine.
- Drawing energy profile change arrows that stretch to the peak of the curve rather than exactly representing the enthalpy change distance from reactants to products.
常見誤解
- The belief that positive charges (protons) move when an insulator becomes electrostatically charged by friction, rather than only negative electrons transferring.
- Thinking that capillaries move physically closer to the skin surface during heat loss, rather than arterioles widening to let more blood pass through the existing capillaries.
- Assuming that any increase in reaction rate implies directly proportional relationships without checking if the ratios between dependent and independent factors are constant.
失分原因
- Omission of units or incorrect units in final calculations, specifically with density (g/cm³) and moments (N m or N cm).
- Vague safety precautions in practical plans, such as saying 'be careful with acid' instead of stating the concrete action 'wear chemical-resistant goggles to protect eyes from corrosive acid splashes'.
- Poor sketching of lines of best fit that do not pass through the origin (0,0) or curves that do not flatten/level off as determined by the limiting reactant.
等級 cut-off 估算
更新: 2026年6月13日
| 等級 | 分數 | 百分比 |
|---|---|---|
| A* | 184/240 | 77% |
| A | 154/240 | 64% |
| B | 124/240 | 52% |
| C | 95/240 | 40% |
| D | 81/240 | 34% |
| E | 68/240 | 28% |
Official grade boundaries published by Cambridge IGCSE grade thresholds (official).
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