📚 AQA A-Level Chemistry: Entry Codes & Qualification Structure | AQA 化学：报考代码与资格结构全解
Every year, thousands of students across the UK sit AQA A-Level Chemistry, but many are confused by the system of 'entries' and 'codes' before they even reach the exam hall. This article unpacks the AQA specification codes, explains what each paper code represents, and shows you how to match your revision to the exam structure.
每年，英国有成千上万的学生参加 AQA 高级水平化学考试（A-Level Chemistry），但许多人在走进考场之前就被“报考（entries）”和“代码（codes）”体系搞得一头雾水。本文将为你们详拆 AQA 教学大纲的代码体系，解释每张试卷代码所对应的内容，并教会大家如何将复习计划与考试结构相匹配。
1. Qualification Structure | 资格证书结构概览
AQA offers two separate chemistry qualifications: the AS Chemistry (code 7404) and the full A-Level Chemistry (code 7405). The AS is a standalone one-year qualification worth half an A-Level, while the A-Level is a two-year linear course examined at the end of Year 13. Students may choose to take only the AS, or continue to the full A-Level.
AQA 提供两门独立的化学资格证书：AS 化学（代码 7404）和完整的 A-Level 化学（代码 7405）。AS 是一门独立的为期一年的资格，相当于半个 A-Level；而 A-Level 是一门两年制线性课程，在 13 年级结束时统一考试。学生可以选择只考 AS，也可以继续攻考完整的 A-Level。
Importantly, the AS grade does not contribute to your A-Level grade. If you sit the AS
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