📚 Year 11 WJEC Computer Science: Intensive Winter Break Revision Plan | Year 11 WJEC 计算机：寒假强化复习计划
Winter break gives you a precious few weeks to turn partial understanding into confident mastery. By following a structured intensive plan, you can target every topic from computer systems to programming without feeling overwhelmed.
寒假为你提供了几周宝贵时间，将一知半解变为胸有成竹。只要按照一份结构化的强化计划去做，你就能从容攻克从计算机系统到编程的每个考点。
This revision guide breaks the holiday into weekly themes, each designed to balance knowledge recall with active problem-solving. It also integrates past paper practice so that by the end of the break you will be fully exam-ready.
这份复习指南把假期划分为若干主题周，每周围绕知识回顾与主动解题交替设计。真题训练也被纳入其中，让你在假期结束时就能完全进入应考状态。
1. Understanding the WJEC Exam Structure | 了解 WJEC 考试结构
Before you plan your hours, make sure you know exactly what you are preparing for. WJEC GCSE Computer Science has two written units: Unit 1 (Understanding Computer Science) and Unit 2 (Computational Thinking and Programming). Your school may also enter you for an on-screen programming task; check your personal timetable.
在安排时间之前，务必先弄清你要准备什么。WJEC 的 GCSE 计算机科学由两个笔试单元组成：单元 1（理解计算机科学）和单元 2（计算思维与编程）。你的学校可能还会为你报名上机编程任务，请核对你的个人考试安排。
Download the official specification from the WJEC website and print the assessment objectives. Highlight command words such as 'describe', 'explain', 'compare' and 'evaluate'—they determine how many marks you can earn.
从 WJEC 官网下载官方大纲并打印评估目标。用荧光笔标出 "describe"、"explain"、"compare"、"evaluate" 等指令词，它们决定着你能够拿到多少分数。
| Component | Type | Duration | Weighting | Key Topics |
|---|---|---|---|---|
| Unit 1 | Written exam | 1 hour 45 mins | 50% | Hardware, software, data representation, networks, cybersecurity, ethical issues |
| Unit 2 | Written exam | 1 hour 45 mins | 50% | Algorithms, programming concepts, debugging, computational logic |
Bookmark the WJEC past papers page and download the latest mark schemes. Mark schemes teach you how to phrase answers to gain full marks, especially on longer 6‑mark questions.
把 WJEC 往年试卷页面加入书签，并下载最新的评分方案。评分方案能教会你如何组织答案以获得满分，尤其是在较长的 6 分题上。
2. Creating Your Personalised Revision Timetable | 制定你的个性化复习时间表
Start by blocking out family commitments, festive days and two 'rest days' per week. Spread your revision across mornings and early afternoons, leaving evenings free for hobbies and relaxation.
先把家庭安排、节日和每周两个"休息日"固定下来。将复习分散在上午和下午早些时候，晚上留给兴趣爱好和放松。
Aim for two focused 45‑minute sessions in the morning and another two after lunch. Between sessions, take a 15‑minute screen‑free break—move, stretch or grab a snack.
每天上午安排两个 45 分钟的高效复习时段，午餐后再安排两个。每两个时段之间休息 15 分钟，彻底远离屏幕，起来走动、拉伸或吃点东西。
| Time | Activity (English) | 活动 (中文) |
|---|---|---|
| 09:00–09:45 | Active recall of theory topics (flashcards, mind maps) | 理论主题主动回忆（闪卡、思维导图） |
| 09:45–10:00 | Break | 休息 |
| 10:00–10:45 | Worked examples and short-answer questions | 例题精练与简答题训练 |
| 10:45–11:00 | Break | 休息 |
| 11:00–11:45 | Hands-on programming or algorithm tracing | 动手编程或算法跟踪 |
| 11:45–12:00 | Break | 休息 |
| 12:00–12:45 | Self-quiz or mini past paper section | 自测或小型真题片段 |
Stick to the same rhythm every weekday. After three days you will find it much easier to concentrate. Post your timetable on the wall so family can support you.
工作日保持同样的节奏。坚持三天之后，你会发现注意力更容易集中。把时间表贴在墙上，让家人也能支持你。
3. Week 1 Focus: Computer Systems and Hardware | 第一周重点：计算机系统与硬件
Begin with the fundamentals because they underpin many higher‑mark questions. Revise the central processing unit (CPU) components: control unit, arithmetic logic unit and registers such as the program counter and accumulator.
从基础入手，因为它们是很多高分题的基础。复习中央处理器 (CPU) 的组成：控制单元、算术逻辑单元以及程序计数器和累加器等寄存器。
Draw and label the fetch‑decode‑execute cycle until you can recite it without notes. Understanding how instructions flow through the CPU helps you explain factors affecting performance, such as clock speed, cores and cache size.
反复绘制取指—解码—执行循环，直到能够脱离笔记复述。理解指令在 CPU 中的流动方式，有助于你解释影响性能的因素，比如时钟速度、核心数量和高速缓存大小。
Move on to memory: RAM, ROM, virtual memory and flash storage. Compare their characteristics using a table—include volatility, speed, capacity and typical use cases. Questions often ask why a tablet uses solid‑state storage instead of a magnetic hard disk.
接着复习存储器：RAM、ROM、虚拟内存和闪存。用表格对比它们的特性——包括易失性、速度、容量和常见应用场景。题目常常会问为什么平板电脑采用固态存储而非机械硬盘。
Finish the week with embedded systems. Recognise examples such as washing machines, microwave ovens and car engine management units. Prepare two short paragraphs contrasting embedded systems with general‑purpose computers.
本周以嵌入式系统收尾。识别洗衣机、微波炉、汽车引擎管理单元等实例。准备两小段话，对比嵌入式系统与通用计算机。
4. Week 1 Continued: Data Representation | 第一周续：数据表示
Mastering binary, denary and hexadecimal conversions is non‑negotiable. Practise conversions daily until they become automatic. Include binary addition and shifts, because WJEC papers often embed these in logic puzzles.
掌握二进制、十进制和十六进制转换是硬性要求。每天练习转换，直到形成条件反射。别忘了二进制加法和移位，因为 WJEC 试卷常将它们融入逻辑谜题中。
Learn how characters are represented using 7‑bit ASCII and Unicode. Explain why Unicode is essential for multilingual software. Make a quick reference card showing the ASCII codes for 'A', 'a', '0' and space.
弄懂如何使用 7 位 ASCII 和 Unicode 表示字符。解释为什么编写多语言软件必须使用 Unicode。制作一张速查卡，列出 'A'、'a'、'0' 和空格的 ASCII 码。
n bit by bit: pixels, colour depth and resolution. Calculate file sizes for a given bitmap— then convert to bytes and kilobytes. Repeat for sound: sample rate, bit depth and duration.
逐位复习图像表示：像素、色深和分辨率。给定位图后计算文件大小——宽度 × 高度 × 色深（以位为单位），再转换为字节和千字节。用同样的方法对待声音：采样率、位深和时长。
Conclude with lossy and lossless compression. Know when JPEG or MP3 are appropriate (lossy) and when you need PNG or FLAC (lossless). Run‑length encoding is a popular WJEC algorithm topic, so write out a few examples by hand.
最后以有损压缩和无损压缩收尾。知道何时该用 JPEG 或 MP3（有损），何时又需要 PNG 或 FLAC（无损）。游程编码是 WJEC 常见的算法考点，请手动写出几个例子。
5. Week 2 Focus: Algorithms and Computational Thinking | 第二周重点：算法与计算思维
Algorithms form the heart of Unit 2. Start by revisiting flowchart symbols and pseudocode conventions used in WJEC mark schemes. Many students lose marks for incorrect arrows or missing 'End' symbols.
算法是单元 2 的核心。先回顾 WJEC 评分方案中使用的流程图符号和伪代码规范。很多学生因箭头错误或遗漏 "End" 符号而失分。
Tackle searching and sorting algorithms: linear search, binary search, bubble sort, insertion sort and merge sort. For each, write the steps in pseudocode, draw the flowchart and trace a short list of numbers. Pay attention to the efficiency differences—big‑O notation is not required, but comparative speed is.
攻克查找与排序算法：线性查找、二分查找、冒泡排序、插入排序和归并排序。对于每一种，用伪代码写出步骤、画出流程图并跟踪一个短数字列表。留意效率差异——不要求大 O 表示法，但比较速度是考点。
Work through structured English and trace tables. Keep a ruler handy; drawing tidy trace tables saves you from careless errors. Use spare past paper questions to practise stepping through an algorithm with pencil and paper.
钻研结构化英语和跟踪表。手边放把尺子，画整洁的跟踪表能避免粗心错误。用额外的往年真题练习用铅笔和纸逐步运行一个算法。
6. Week 2 Programming Practice and Debugging | 第二周编程练习与调试
Set aside at least 20 minutes each day for hands‑on coding. Use a lightweight Python environment such as IDLE or Thonny. If your school uses VB.NET or another language, stick with that syntax.
每天至少留出 20 分钟动手编程。使用 IDLE 或 Thonny 等轻量级 Python 环境。如果你学校用的是 VB.NET 或其他语言，就坚持那种语法。
Re‑program common challenges: input validation, count‑controlled loops, arrays (lists) and string manipulation. WJEC often asks you to correct or complete partial code, so break your own code deliberately and then fix it.
重新编写常见题目：输入验证、计数控制循环、数组（列表）和字符串操作。WJEC 经常要求你更正或补全不完整的代码，因此故意破坏你自己的代码再去修复。
Master file handling—open, read, write and close. Questions may present a text file of results and ask you to calculate an average. Practise commenting your code clearly; comments can earn marks for explaining logic.
掌握文件处理——打开、读取、写入和关闭。考题可能给出一个存放成绩的文本文件，要求你计算平均值。练习清晰地撰写注释，解释逻辑也能得分。
Debug with purpose: learn to spot off‑by‑one errors, incorrect indentation and misuse of assignment versus comparison. Keep a 'bug diary' where you record each mistake and the lesson learned.
有目的地调试：学会发现差一错误、缩进错误以及混淆赋值与比较运算符。准备一本"错误日志"，记录每次出错和学到的教训。
7. Week 3 Focus: Networking and Cybersecurity | 第三周重点：网络与网络安全
Networking is a high‑yield topic. Draw and label diagrams of LAN, WAN, and common topologies (star, mesh, bus). Know the hardware: switch, router, NIC and WAP. Explain the role of each in one sentence.
网络是得分很高的主题。绘制并标记 LAN、WAN 以及常见拓扑结构（星型、网状、总线型）的示意图。熟知硬件：交换机、路由器、网卡和无线接入点，并能用一句话解释每个设备的作用。
Memorise the TCP/IP protocol stack layers—application, transport, internet and link—and their respective functions. Questions often ask which layer is responsible for packet routing (internet) or error checking (transport).
熟记 TCP/IP 协议栈的四层——应用层、传输层、互联网层和链路层——及其各自功能。题目常问哪一层负责分组路由（互联网层）或差错校验（传输层）。
Cybersecurity threats appear in almost every paper. Revise malware types (virus, worm, Trojan, ransomware), social engineering (phishing, blagging) and brute‑force attacks. For each, list at least two prevention methods.
网络安全威胁几乎每份试卷都会出现。复习恶意软件类型（病毒、蠕虫、木马、勒索软件）、社会工程学攻击（网络钓鱼、冒充欺诈）和暴力破解。针对每种列出至少两种防范措施。
ards that link a threat to a specific prevention, e.g. shoulder surfing → privacy screens.
理解渗透测试、网络安全策略和生物识别安全。制作闪卡，将威胁与特定防范措施联系起来，例如肩窥 → 防窥屏幕。
8. Week 3: Ethical, Legal and Environmental Impacts | 第三周：伦理、法律和环境影响
These topics carry easy marks if you learn the key legislation. Revise the Data Protection Act 2018 with its six principles, the Computer Misuse Act 1990 (unauthorised access, intent to commit further offences) and the Copyright, Designs and Patents Act 1988.
只要记熟关键法案，这些主题很容易得分。复习 2018 年《数据保护法》及其六项原则、1990 年《计算机滥用法》（未经授权访问、意图进一步犯罪）以及 1988 年《版权、外观设计和专利法》。
Ethical debates cover privacy, surveillance, data misuse and the digital divide. Practise writing balanced paragraphs that present an argument and a counter‑argument, just as a 6‑mark 'discuss' question expects.
伦理议题涵盖隐私、监控、数据滥用和数字鸿沟。练习撰写平衡的段落，提出一个论点和一个反方论点，这正是 6 分 "discuss" 题所要求的。
Environmental points focus on e‑waste, energy consumption of data centres and the benefits of remote working. Collect statistics such as 'UK data centres consumed 2.5 TWh in one year' to support your answers.
环保要点集中在电子垃圾、数据中心能耗和远程办公的优势。收集诸如"英国数据中心
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