Bob Tait's exams might be more straight forward.... shame when they're not the CASA exams!
I agree that some of the material is a bit esoteric, (studying omega and doppler nav for example...) and some of the questions rather badly worded. Unfortunately its just one of those things you have to try to get through.
James Michael, I agree about much of what you have said, however unfortunately the fact remains that the question in question could easily have been written in a way that makes comprehension easy, however it has not been written that way. I remember leaving my exams always thinking that the person who wrote the question was not a native English speaker.