This student-facing guide offers elite, evidence-based exam tips and strategies for Cambridge IGCSE Physics (0625). It breaks down the exam structure (Papers 2, 4, and 6), analyzes high-frequency pitfalls based on examiner reports from 2023-2025, and provides legal calculator shortcuts and revision hacks to secure top marks.
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.
AO1: Knowledge with understanding (50%)
AO2: Handling information and problem-solving (30%)
AO3: Experimental skills and investigations (20%)
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: 1Physical quantities and measurement techniques
Substituting numerical values in 'show that' calculation questions without first stating the starting algebraic equation in symbols.
如何避免: Always write down the general formula in algebraic symbols (e.g., P = E / t) on the very first line before substituting any numbers.
2high涉及分数: 1Mass and weight
Using g = 10 N/kg or g = 9.81 m/s^2 instead of the syllabus-mandated value.
如何避免: Use exactly g = 9.8 N/kg (or m/s^2) for all gravitational calculations, as printed on the exam cover page.
3high涉及分数: 2Electrical quantities
Failing to convert time from minutes or hours into SI seconds in electrical and thermal energy equations.
如何避免: Always multiply minutes by 60 or hours by 3600 before using time in formulas like Q = It or E = VIt.
4medium涉及分数: 2Momentum
Ignoring the vector nature of velocity in momentum calculations, leading to simple subtraction of values during a rebound.
如何避免: Assign a positive sign to the initial velocity and a negative sign to the rebound velocity so that the change in momentum is calculated correctly as m(v - u).
5high涉及分数: 1Physical quantities and measurement techniques
Over-rounding intermediate values in multi-step calculations, which leads to final answers that drift outside the accepted range.
如何避免: Keep the full raw decimal value on your calculator screen during intermediate steps, and round only your final answer to 2 or 3 significant figures.
6medium涉及分数: 1Physical quantities and measurement techniques
Writing vague descriptions for variables in Paper 5/6, such as stating 'control the amount of water' instead of 'volume of water'.
如何避免: Use precise scientific terms and state that you will 'keep the volume of water constant' or 'measure the mass of water using a balance'.
7medium涉及分数: 1Physical quantities and measurement techniques
Choosing awkward graph scales (such as multiples of 3, 6, or 7) on Paper 5/6 that make accurate plotting extremely difficult.
如何避免: Select simple scale factors of 1, 2, 5, or 10 per large square so that every small square represents a straightforward decimal value.
8medium涉及分数: 1Electromagnetic effects
Confusing slip rings in an a.c. generator with split-ring commutators in a d.c. motor.
如何避免: Remember that a.c. generators use continuous slip rings to maintain a rotating connection, while d.c. motors use split-ring commutators to reverse the current direction every half-turn.