Master Cambridge IGCSE Combined Science (0653) with examiner-backed insights, time-management techniques, and targeted strategies to avoid critical pitfalls in Biology, Chemistry, and Physics.
阅读时间 5 分钟更新于: 2026年6月21日
试卷概览
卷数
3
总分
160
考试时间
3小时
题型
3
试卷
时间
分数
题数
比重
题型
Paper 2: Multiple Choice (Extended)
45分钟
40
—
—
—
Paper 4: Theory (Extended)
1小时 15分钟
80
—
—
—
Paper 6: Alternative to Practical
1小时
40
—
—
—
评级
A*ABCDEFGU
计算器规定
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.
根据历届试题与评分标准整理（2023–2025）。
计算器程序
Table mode for roots & turning points
Scientific calculator (e.g. Casio fx-991 series)
用途: Tabulate \(y\) across a range of \(x\) to locate sign changes (roots) and approximate maxima/minima.
使用时机: Solving or sketching a function when you want to find where its graph crosses or turns.
步骤
Enter the function in TABLE mode, set the start, end and step, then read where the sign of \(y\) changes or where it peaks.
考试提示: 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)
用途: Read the mean \(\bar{x}\) and standard deviation directly, and the gradient/intercept (and \(r\)) of a linear regression for bivariate data.
使用时机: Any data-handling, statistics, or required-practical analysis question.
步骤
Enter the data in STAT mode (1-VAR or A+BX), then recall \(\bar{x}\), \(\sigma\) or the regression coefficients.
考试提示: 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)
用途: Keep full-precision intermediate values to avoid rounding errors.
使用时机: Multi-step calculations where premature rounding loses the final accuracy mark.
步骤
Use Ans, STO/RCL or the M+ memory to reuse the unrounded result of each step; round only the final answer.
考试提示: 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)
用途: Use the built-in EQN/SOLVE mode to verify roots of quadratics or simultaneous equations you have already solved by algebra.
使用时机: As a check only, after solving by hand.
步骤
Enter the coefficients in EQN mode (or use SOLVE) and confirm they match your worked solution.
考试提示: Allowed on papers where a calculator is permitted; use a silent scientific calculator with no stored content and show your method.
常见错误
1high涉及分数: 1Organic chemistry
Stating that a hydrocarbon contains carbon and hydrogen, but omitting the word 'only'.
如何避免: Always define a hydrocarbon as a compound made of hydrogen and carbon ONLY.
2high涉及分数: 2Motion, forces and energy
Failing to convert mass in grams to kilograms when calculating Weight (W = mg) or Gravitational Potential Energy (GPE = mgh).
如何避免: Divide the mass in grams by 1000 to convert to kilograms before multiplying by g (9.8 m/s²).
3high涉及分数: 1Electricity
Forgetting to take the reciprocal at the final step when calculating combined resistance of parallel resistors.
如何避免: After finding the sum of 1/R1 + 1/R2, use the 1/x (or x⁻¹) button to flip the fraction back to obtain the final resistance.
4medium涉及分数: 1Waves
Drawing messy, freehand lines or sketchy/double lines for light rays on reflection or lens diagrams.
如何避免: Always use a sharp HB pencil and a clear ruler. Draw a single, clean, continuous straight line to represent each ray of light.
5medium涉及分数: 1Reproduction
Stating that human fertilisation occurs in the uterus.
如何避免: Remember that fertilisation takes place in the oviducts (fallopian tubes), while the fetus develops in the uterus.
6high涉及分数: 2Experimental techniques and chemical analysis
Using vague qualitative language such as 'the temperature changes' or 'be careful' in Paper 6 planning and design questions.
如何避免: State exact quantitative directions ('the temperature decreases') and specify precise apparatus controls ('use a water bath to maintain a constant temperature').