an exam of a standard between GCSE and A level taken in England and Wales, which allows more subjects to be studied than is possible at A level because less information needs to be learned for it. Students then take A2 exams, usually a year later, which together make a full A level qualification.

I'm doing (= studying) five AS levels. 我正在学习5门高级补充程度会考课程。

AS level French 高级补充程度会考法语考试