CFAI Text: past exam questions difficulty?

In the official CFAI texts, there are past exam questions from the 2005 test in the end-of-chapter reviews. My question is if the level of difficulty of these questions is reflective of the actual exam, or if they tend to pick the easiest past exam questions to reprint? Few of them seem terribly difficult, and some of them are a joke.

I think they expose you to both ends of the difficulty spectrum.