Cambridge IAL · 考试技巧

Economics (9708) 考试技巧

Comprehensive study and exam package for Cambridge International A Level Economics (9708), including paper structures, high-impact exam-day strategies, marking criteria secrets, and a breakdown of common mistakes sourced from official examiner reports.

阅读时间 4 分钟更新于: 2026年6月21日

试卷概览

卷数
4
总分
180
考试时间
6小时 15分钟
题型
3
试卷时间分数题数比重题型
Paper 11小时30
Paper 22小时60
Paper 31小时 15分钟30
Paper 42小时60
评级
A*ABCDE
计算器规定

A silent scientific calculator is required where the syllabus permits one. It must NOT be graphical, programmable, or capable of symbolic algebra (CAS), and it must contain no stored programs or notes.

  • AO1: AO1 Knowledge and understanding (30%)
  • AO2: AO2 Analysis (40%)
  • AO3: AO3 Evaluation (30%)

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, but the calculator must be silent, non-graphical, non-programmable and free of stored content; always show the working the mark scheme requires.

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, but the calculator must be silent, non-graphical, non-programmable and free of stored content; always show the working the mark scheme requires.

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, but the calculator must be silent, non-graphical, non-programmable and free of stored content; always show the working the mark scheme requires.

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, but the calculator must be silent, non-graphical, non-programmable and free of stored content; always show the working the mark scheme requires.

常见错误

  1. 1high涉及分数: 4Classification of goods and services

    Classifying state-provided private/merit goods (like free municipal healthcare or state schools) as public goods.

    如何避免: Clearly identify that municipal healthcare and state schools are rival and excludable, which classifies them as private/merit goods provided free of charge, not true public goods (which must be non-rival and non-excludable).
  2. 2high涉及分数: 2Factors of production

    Conflating overall industrial 'production' with factor 'productivity'.

    如何避免: Define production as total output volume (e.g. total tons of agricultural output) and productivity as output per unit of factor input (e.g. output per worker hour).
  3. 3high涉及分数: 3Production possibility curves

    Shifting the entire PPC curve to the left when illustrating short-run domestic unemployment.

    如何避免: Keep the PPC stationary and draw a point moving from the curve to the interior space, representing the under-utilization of existing resources.
  4. 4medium涉及分数: 2Aggregate Demand and Aggregate Supply analysis

    Mislabeling aggregate demand and supply (AD/AS) diagrams with microeconomic axes labels (Price and Quantity).

    如何避免: Always label macroeconomic diagram axes as 'Price Level' (vertical) and 'Real GDP' or 'Real Output' (horizontal).
  5. 5high涉及分数: 4Effectiveness of policy options to meet all macroeconomic objectives

    Providing one-sided analysis in Part (b) essays, which caps the maximum score for AO3 Evaluation.

    如何避免: Develop a balanced two-sided perspective highlighting both benefits and limitations of a policy, ending with a highly context-specific, justified final conclusion.
  6. 6medium涉及分数: 6Current account of the balance of payments

    Conflating 'Terms of Trade' (relative price index ratio) with 'Balance of Trade' (monetary net trade value).

    如何避免: Define Terms of Trade mathematically as (Index of Export Prices / Index of Import Prices) * 100, distinguishing it completely from net current account transactions.

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