Hi David -
One of the features I found handy when I was trying to get a reality check during my studies was the "Quiz" option - it basically allows you to create a targeted mini-exam where you get to determine the topic (or "random"), the length, and whether the quiz is timed or untimed. I believe it draws questions from the same pool, so you won't necessarily get unique questions each time, but if you want to drill a specific knowledge area or domain it will let you do that. (Just keep in mind that if you drill each knowledge area several times, you will be getting repeat questions when you take the full practice exams.)