📚 Understanding AQA Combined Science: Trilogy Extension Tier Grades 9-9 to 4-4 | 理解 AQA 综合科学：三部曲扩展层 9-9 至 4-4 等级
The Extension Tier of AQA Combined Science: Trilogy targets a range of double grades from 9-9 down to 4-4. However, saying it targets 'six grades' is only a shorthand: the official qualification uses a wider 17-grade scale with mixed pairs such as 9-8 and 7-6 between the main matching grades.
AQA 综合科学：三部曲的扩展层针对从 9-9 到 4-4 的一系列双重等级。然而，说它针对“六个等级”只是一种简略说法：官方资格使用更广泛的 17 个等级量表，在主要相同等级之间还有如 9-8 和 7-6 这样的混合配对。
1. What Is AQA Combined Science: Trilogy? | 什么是 AQA 综合科学：三部曲？
AQA Combined Science: Trilogy is a double-award GCSE that covers biology, chemistry and physics in one qualification. Students sit six written papers, and the final result is reported as a pair of numbers such as 9-9, 8-7 or 4-4.
AQA 综合科学：三部曲是一门双证书 GCSE，将生物、化学和物理合并在一个资格中。学生参加六份书面试卷，最终成绩以成对数字报告，例如 9-9、8-7 或 4-4。
It is called a double award because it counts as two GCSEs. The double grade reflects overall attainment across all three sciences, not separate grades for each science subject.
它被称为双证书，因为它相当于两个 GCSE。双重等级反映三门科学的整体表现，而不是每门科学学科的单独等级。
2. Foundation and Extension Tiers | 基础层与扩展层
AQA uses two tiers of entry: Foundation and Higher. In AQA Combined Science: Trilogy, the Higher Tier is sometimes referred to as the Extension Tier, especially in international centres or legacy materials.
AQA 使用两个报名层级：基础层和高级层。在 AQA 综合科学：三部曲中，高级层有时被称为扩展层，尤其是在国际考点或旧版材料中。
Foundation Tier covers grades 5-5 down to 1-1, while the Extension Tier targets 9-9 down to 4-4. The tier choice should be based on a student's secure working grade rather than their hoped-for grade.
基础层覆盖 5-5 至 1-1 的等级，而扩展层针对 9-9 至 4-4。层级选择应基于学生稳定的学习等级，而不是他们期望的等级。
If a student is securely working at grade 5-5 or above, the Extension Tier is usually the better choice because it keeps the top grades open. However, entering a student who is only working at grade 3-3 into the Extension Tier is risky without a clear intervention plan.
如果学生稳定在 5-5 或以上，扩展层通常是更好的选择，因为它保留了获得最高等级的机会。然而，在没有明确干预计划的情况下，让一个仅处于 3-3 水平的学生报名扩展层是有风险的。
3. The 17-Grade Scale for Combined Science | 综合科学的 17 个等级量表
AQA Combined Science: Trilogy does not use a six-point scale. It uses a 17-grade scale from 9-9 down to 1-1, with mixed pairs such as 9-8, 8-7, 7-6, 6-5, 5-4, 4-3, 3-2 and 2-1.
AQA 综合科学：三部曲不使用六个等级的量表。它使用从 9-9 到 1-1 的 17 个等级量表，其中包括 9-8、8-7、7-6、6-5、5-4、4-3、3-
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