A comprehensive, examiner-designed preparation package for Cambridge IGCSE Co-ordinated Sciences (Double Award) 0654. This package includes a detailed breakdown of all papers, an exhaustive exam-tips study guide written by an expert tutor, a list of high-priority student mistakes from recent exam cycles, and a step-by-step scientific calculator methodology to maximize raw marks across the Biology, Chemistry, and Physics components.
読了時間 4 分更新日: 2026年6月21日
試験の概要
試験数
3
満点
220
制限時間
4時間 15分
出題形式
3
試験
時間
配点
問題数
配点比率
出題形式
Paper 2 Multiple Choice (Extended)
45分
40
—
—
—
Paper 4 Theory (Extended)
2時間
120
—
—
—
Paper 6 Alternative to Practical
1時間 30分
60
—
—
—
評価段階
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電卓の規定
A silent scientific calculator may be used on papers where calculators are permitted (some papers are non-calculator). It must not be graphical or programmable and must hold no stored information.
AO1: AO1: Knowledge with understanding (50%)
AO2: AO2: Handling information and problem-solving (30%)
AO3: AO3: Experimental skills and investigations (20%)
過去問と採点基準にもとづいて作成（2023–2025）。
電卓プログラム
Table mode for roots & turning points
Scientific calculator (e.g. Casio fx-991 series)
目的: Tabulate \(y\) across a range of \(x\) to locate sign changes (roots) and approximate maxima/minima.
使う場面: Solving or sketching a function when you want to find where its graph crosses or turns.
手順
Enter the function in TABLE mode, set the start, end and step, then read where the sign of \(y\) changes or where it peaks.
試験での注意: Allowed on papers where a calculator is permitted; use a silent scientific calculator with no stored content and show your method.
Statistics mode (mean, SD & regression)
Scientific calculator (e.g. Casio fx-991 series)
目的: Read the mean \(\bar{x}\) and standard deviation directly, and the gradient/intercept (and \(r\)) of a linear regression for bivariate data.
使う場面: Any data-handling, statistics, or required-practical analysis question.
手順
Enter the data in STAT mode (1-VAR or A+BX), then recall \(\bar{x}\), \(\sigma\) or the regression coefficients.
試験での注意: Allowed on papers where a calculator is permitted; use a silent scientific calculator with no stored content and show your method.
Carry exact values with Ans & memory
Scientific calculator (e.g. Casio fx-991 series)
目的: Keep full-precision intermediate values to avoid rounding errors.
使う場面: Multi-step calculations where premature rounding loses the final accuracy mark.
手順
Use Ans, STO/RCL or the M+ memory to reuse the unrounded result of each step; round only the final answer.
試験での注意: Allowed on papers where a calculator is permitted; use a silent scientific calculator with no stored content and show your method.
Equation solver — to CHECK your working
Scientific calculator (e.g. Casio fx-991 series)
目的: Use the built-in EQN/SOLVE mode to verify roots of quadratics or simultaneous equations you have already solved by algebra.
使う場面: As a check only, after solving by hand.
手順
Enter the coefficients in EQN mode (or use SOLVE) and confirm they match your worked solution.
試験での注意: Allowed on papers where a calculator is permitted; use a silent scientific calculator with no stored content and show your method.
よくあるミス
1high影響する配点: 2Motion, forces and energy
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).
回避方法: Build a checklist step: read the question, highlight standard SI units, execute calculations (e.g., dividing cm by 100 to get meters) *before* substituting into equations.
2high影響する配点: 1Coordination and response
Using general, non-scientific terminology instead of specific required vocabulary (such as writing 'blood vessels expand' instead of 'arterioles dilate' for vasodilation).
回避方法: Study official physiological descriptions. Explicitly use 'arterioles dilate' and 'capillaries' when explaining thermoregulation in the skin.
3medium影響する配点: 2Organic chemistry
Omitting the production of water in the description of condensation polymerisation of nylon from dicarboxylic acid and diamine.
回避方法: Remember that condensation polymerisation *always* produces a small molecule (usually water or hydrogen chloride) in addition to the polymer chain.
4high影響する配点: 1Chemical energetics
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.
回避方法: Verify that your activation energy (Ea) arrow starts at the reactants and goes to the peak, whereas the enthalpy change (delta H) arrow connects the level of reactants to products exactly.
5medium影響する配点: 2Waves
Misinterpreting the two-way travel of ultrasound waves, failing to divide the total echo time by 2, leading to doubled distance values.
回避方法: When a sound or ultrasound wave travels to a boundary and bounces back, always halve either the total time or the final computed distance value (\( d = \frac{v \times t}{2} \)).
6high影響する配点: 3Experimental techniques and chemical analysis
Drawing sketchy, multi-lined biological drawings rather than clear, continuous outlines in Paper 5/6.
回避方法: Use a sharp HB pencil to make a single, sweeping continuous line outline. Do not shade or add artistic cross-hatching to biological sketches.
7high影響する配点: 1Chemical reactions
Using imprecise words like 'more collisions' rather than 'more frequent collisions' in rate-of-reaction explanations.
回避方法: Always refer to rate. Use the specific phrasing 'collisions per unit time' or 'more frequent successful collisions' to secure full marks.
8medium影響する配点: 1Reproduction
Confusing mitosis and meiosis when discussing the division of a zygote or gamete production.
回避方法: Remember: Mitosis creates genetically identical cells for growth and repair. Meiosis produces genetically diverse haploid gametes (sperm and egg).