The problem with the theory is that most of it is gash, and completely irrelevant to GA pilots. 90% of it gets core-dumped as soon as the exams are over. The only bits I really remembered were from the Met exam.
You CAN'T do this with the FAA IR, as you get a VERY severe oral grilling before you even get into the aircraft to do your flight test. No such grilling is undertaken in Euroland.