I did last months Systems exams (LGU DL student) and thought that was a bitch of a paper too. (Got 79% so jobs a goodun!). There were 7 questions on gear/wheel/brakes and 5 on magnetos. What is that all about? So go get them. Agree with Alex it could be any of the three he mentions. But what do we know, we just spent hundreds of hours reading the books!