Not really. Stats only provided suspicion. They got a tip off for confirmation. I think he might have been bluffing re knowing the ID of the participants though.
As far as I can tell they were using a commercially available test bank, supplied by a textbook publisher, which leaked. Seems like they were asking for trouble.
At the mickey-mouse level of my English classes, at least, canned commercial test material is mostly unusable, though they might have a better quality supply.
Mostly I use them as a basis for my token “critical thinking/why doesn’t this make sense?” questions, which students hate, since they consider thinking an unreasonable and cruel punishment.