I wish I could remember what my lever was tuned to - was it E flat? Anyway, it was the one that gave you the greatest variation of major/minors without having to retune the strings.
Presumably if there was a grading where one of the keys was not included in the (let's say for argument) E flat tuning range, then you'd have to retune it for the test? I don't know if you'd be called on to retune it during...?
Pedal is supposedly easy for scales - it's just a case of remembering where to put each of the seven levers (sharp, neutral or flat), and away you go! Straight up and down one string at a time. However, at grade 3 I'm really struggling to remember what pedal goes where, and it was even worse when I played lever!!!