The second half of an A level which is divided into two discrete components. Frequently attributive, especially in "A2 level".
The A2 level was introduced under the Curriculum 2000 reforms, which split the A level into six units to be completed over two years, with the first three units constituting an independent qualification, the Advanced Subsidiary level, and completion of the remaining three units (the A2 level) being required for the award of a full A level.
1990s; earliest use found in The Times Educational Supplement. From the initial letter of advanced + two.