I guess that was pre-1968 before the massive increase in University Cadetships, Pontius? Quite probable that things weren't quite so tight back then, regarding pilot suitability.
We had a few (very few) people who couldn't manage the Chipmunk when I was a student in '69-'73; however, when I went back as a QFI in 1989, the CFI used to hold staff meetings and we'd root out those who clearly weren't pulling their weight. There would be a queue of people outside the bosses office later in the week who would thn be given the bad news.... But people would have to be pretty awful to be chopped for lack of flying
skill on the Bulldog. (Of course if they could tell their ar$e from their elbows, they could always join as a navigator
)
And that was before this streaming nonsense started!