Cambridge IGCSE · 分析与预测
2023 Cambridge IGCSE Sciences - Co-ordinated (Double) (0654) 历年真题分析与预测
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
分析模拟试题
难度 3.5/5
总分
220
时间
255 分钟
最高频考点
—
分卷
卷二 選擇題 (Extended): 40 分 · 45 分钟Paper 4 Theory (Extended): 120 分 · 120 分钟Paper 6 Alternative to Practical: 60 分 · 90 分钟
考官重点
官方报告整理常见失分点
- 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.
常见误区
- 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.
等级分数线估算
更新: 2026年6月13日
| 等级 | 分数 | 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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