📚 AQA A Level Maths Unit 4 Mark Scheme Jan 2020 | AQA A Level 数学第四单元2020年1月评分方案解析
The AQA A Level Maths Unit 4 paper, examined in January 2020, tests Pure Core 4 content such as binomial expansion, partial fractions, parametric equations, vectors, and differential equations. This article explains how the mark scheme awards method marks, accuracy marks, and follow-through marks, so you can revise more effectively.
AQA A Level 数学第四单元 2020 年 1 月试卷考查纯数学核心 4 内容，包括二项式展开、部分分式、参数方程、向量和微分方程。本文解读评分方案如何给予方法分、准确分和跟进分，帮助你更有针对性地复习。
1. What the Unit 4 Mark Scheme Covers | 第四单元评分方案涵盖内容
The Unit 4 mark scheme is designed for AQA Pure Core 4 (MPC4). It covers questions on advanced algebra, calculus, coordinate geometry, and vectors. Each mark is labelled as M (method), A (accuracy), B (independent/blanket), or E (explanation).
第四单元评分方案针对 AQA 纯数学核心 4（MPC4）设计，涵盖高级代数、微积分、坐标几何和向量等内容。每个分数都标注为 M（方法分）、A（准确分）、B（独立分）或 E（解释分）。
In the January 2020 paper, the total mark was typically 75, with a mixture of short and multi-step questions. The mark scheme splits questions into sub-parts, each with a clear allocation of marks.
2020 年 1 月试卷总分通常为 75 分，包含简答题和多步骤综合题。评分方案将每道题拆分为若干小问，每个小问都有明确的分数分配。
2. Assessment Objectives in the January 2020 Paper | 2020年1月试卷的评估目标
AQA sets three assessment objectives: AO1 tests routine procedures, AO2 tests reasoning and problem solving, and AO3 tests modelling and interpretation. Unit 4 mark scheme heavily rewards correct method even if the final answer is wrong.
AQA 设定三个评估目标：AO1 考查常规计算流程，AO2 考查推理与问题解决，AO3 考查建模与解释。第四单元评分方案高度认可正确的方法，即使最终答案有误也能获得方法分。
A typical mark such as M1 A1 means one mark for using a correct method, and one for reaching the correct simplified answer. If you make a slip but carry it forward correctly, you may earn A1ft or B1ft.
典型的给分方式如 M1 A1 表示一个方法分用于采用正确方法，一个准确分用于得出正确化简后的答案。如果你有小失误但后续正确使用该结果，可能获得跟进准确分 A1ft 或跟进独立分 B1ft。
| Objective | Focus | Typical Weighting |
|---|---|---|
| AO1 | Routine methods, basic algebra, standard integrals | ~50% |
| AO2 | Proof, reasoning, multi-step problems | ~30% |
| AO3 | Modelling, interpreting context, evaluating results | ~20% |
The table shows that AO1 routine marks form about half of the paper, AO2 reasoning marks about thirty percent, and AO3 modelling marks about twenty percent. Although the weightings are approximate, the emphasis on method marks runs through every question.
上表显示，AO1 常规分约占一半，AO2 推理分约占三成，AO3 建模分约占两成。虽然权重为近似值，但评分方案中对方法分的强调贯穿所有题目。
3. Binomial Expansion - Where Marks Are Awarded | 二项式展开——得分点在哪里
Unit 4 frequently asks students to expand expressions such as (1 + kx)n for rational n, or to expand (a + bx)n by first taking out a factor. The mark scheme awards M1 for the correct form of the first three terms and A1 for each simplified coefficient.
Published by TutorHao | Mathematics Revision Series | aleveler.com
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