My understanding is that there is indeed a large bank of questions and the test rotates among them. One commonality between exams seems to be that the thing is weighted heavily toward esoteric weather questions. It was for mine and has been for most of the folks with which I've spoken since. It's good to have access to METAR and TAF codes available. Also, spend some time on the more obscure markings on the high level prog charts.

See you on line soon!