AS level

Collins Concise English Dictionary © HarperCollins Publishers::

AS level noun

1. a public examination taken for the General Certificate of Education, with a smaller course content than an A level: since 2000 taken either as the first part of a full A level or as a qualification in its own right
2. the course leading to this examination
3. (as modifier): AS-level English
4. a pass in a subject at AS level: I've got three AS levels