Thanks very much for part 2, I found part 1 very helpful in reviewing for the exam (which I passed, thanks!). Although I work with XML every day on the job, naturally we tend to get rusty on those things that we don't use every day. For me, it had been a long time since we had used DTDs at work, so your review in part 1 was very helpful to refresh my memory.
Again thanks very much for the effort you have put into creating this resource. It is excellent, and I think every exam taker should review parts 1 and 2 at least once before taking the exam.