📚 IGCSE Chemistry Assessment Overview | IGCSE 化学考试评估概览
The IGCSE Chemistry qualification is assessed through a combination of multiple-choice, written theory and practical-based papers. Understanding how the papers are structured, how marks are weighted and what skills are tested is essential for effective revision. This guide breaks down the assessment overview for Cambridge IGCSE Chemistry (0620), which is the most widely taken international specification, while noting that other boards follow a similar format.
IGCSE 化学资格证书通过选择题、理论笔试和实验相关试卷相结合的方式进行评估。了解试卷结构、分数权重以及考查技能对有效复习至关重要。本指南以最广泛采用的剑桥 IGCSE 化学（0620）为例分解考试评估概览，同时说明其他考试局的格式大致相似。
1. Understanding the Assessment Structure | 了解评估结构
Cambridge IGCSE Chemistry is assessed through three examination papers. All candidates take one multiple-choice paper, one theory paper and either a practical test or an alternative to practical paper. The total qualification combines written knowledge, application of concepts and practical understanding.
剑桥 IGCSE 化学通过三份试卷进行评估。所有考生需参加一份选择题试卷、一份理论试卷，以及一份实验操作考试或实验替代试卷。总成绩综合考查书面知识、概念应用和实验理解。
The table below summarises the available papers, their durations, marks and weightings. The same structure applies to Core and Extended candidates, but the paper numbers differ according to tier.
下表总结了可选试卷、考试时长、分值及权重。核心和拓展层考生结构相同，但试卷编号因层级而异。
| Paper | 试卷 | Duration | 时长 | Marks | 分数 | Weighting | 权重 |
|---|---|---|---|
| Paper 1: Multiple Choice (Core) | 试卷一：选择题（核心） | 45 min | 45分钟 | 40 | 30% |
| Paper 2: Multiple Choice (Extended) | 试卷二：选择题（拓展） | 45 min | 45分钟 | 40 | 30% |
| Paper 3: Theory (Core) | 试卷三：理论（核心） | 1 h 15 min | 1小时15分钟 | 80 | 50% |
| Paper 4: Theory (Extended) | 试卷四：理论（拓展） | 1 h 15 min | 1小时15分钟 | 80 | 50% |
| Paper 5: Practical Test | 试卷五：实验操作考试 | 1 h 15 min | 1小时15分钟 | 40 | 20% |
| Paper 6: Alternative to Practical | 试卷六：实验替代笔试 | 1 h | 1小时 | 40 | 20% |
2. Core and Extended Tiers | 核心与拓展层级
IGCSE Chemistry has two entry tiers: Core and Extended. Core candidates take Papers 1, 3 and either Paper 5 or Paper 6. They can achieve grades C to G, with grade C being the highest available on the Core tier.
IGCSE 化学分为核心和拓展两个报考层级。核心层考生参加试卷一、试卷三以及试卷五或试卷六。他们可以获得 C 到 G 等级，其中 C 是核心层可获得的最高等级。
Extended candidates take Papers 2, 4 and either Paper 5 or Paper 6. They can achieve grades A* to G, giving access to the full grade range. Extended papers include extra topics and more demanding application questions, so they suit students aiming for higher grades.
拓展层考生参加试卷二、试卷四以及试卷五或试卷六。他们可以获得 A* 到 G 等级，进入完整等级范围。拓展试卷包含额外主题和更高要求的应用问题，因此适合目标更高的学生。
Your teacher usually recommends the most suitable tier after looking at your progress, mock results and ability to handle Extended content. Switching tiers is possible before final entry deadlines, but the syllabus content differs, so the decision should be made early.
老师通常会在考查你的学习进展、模拟考试成绩以及处理拓展内容的能力后推荐最合适的层级。在最终报名截止日期前可以更换层级，但课程内容不同，因此应尽早做出决定。
3. Multiple-Choice Papers | 选择题试卷
Paper 1 (Core) and Paper 2 (Extended) are both 45-minute multiple-choice examinations. Each paper contains 40 questions, and every question is worth one mark, giving a total of 40 marks. They account for 30% of the final IGCSE Chemistry grade.
试卷一（核心）和试卷二（拓展）均为 45 分钟的选择题考试。每
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