Having just played the GC set for History in Division 7, I noticed that 4 of the 15 questions were taken from one quiz. Moreover, this quiz, though classified in History, seems to be more Geography than History (especially the 4 questions which showed up in the GC set). Each one of the questions dealt with a specific state in Malaysia, and not from a particularly historical viewpoint.
I just don't see how, out of all the potential History quizzes to choose from, more than a quarter of the questions in a GC set can come from one quiz. If nothing else, it seems statistically unlikely.
I mention this just in case it shows a flaw in the selection of questions for GC sets.