O-level
From Tardis Wiki, the free Doctor Who reference
O-Levels were exams taken by 15 and 16-year-olds.
The Fourth Doctor claimed to have received an O-level in Starship Weaponry, while attending Gallifrey Comp. (COMIC: Doctor Who and the Star Beast)
Ace failed her chemistry O-Levels, despite being skilled at it. (TV: Dragonfire)
Yvonne Hartman did an O level in biology at comprehensive school. (AUDIO: The Rockery)