[mattuk89]

This is actually more likely the other way around. The perfections submitted, along with ranking for each class, were compiled and submitted for the purpose of awarding grades. They were always known to be a replacement for the exams.

Mocks on the other hand are graded with a view to provide the desired psychological effect (i.e. either as a boost or a kick up the rear). So mock results may well be less fair. This is coming from my partner who is a secondary school teacher.