/ eɪ ˈes levl; NAmE / noun
[ C , U ] Advanced Subsidiary (level); a British exam usually taken in Year 12 of school or college (= the year before the final year) when students are aged 17. Together with A2 exams, AS levels form the A-level qualification, which is needed for entrance to universities :
AS exams
Students will normally take four or five AS subjects.
She's doing an AS (level) in French.
More than 20 subjects are on offer at AS level at our college.