What do you think I need to take away from the Econ section?

I made my way through book 2 (in the Kaplan guides) for economics - overall, I had a much easier time with this material than book one. I consitantly scored very well in the concept checkers and the end of book test (giving myself a minute max per question, my overall score was an 84). What I found strange, however, was even though they spent a considerable part of the book using S/D curves to explain the concepts, most of the questions only relied very lightly on them. This worries me a bit, because while I socred very well on the end of the book questions, I still have occasional difficultly with some of the S/D chart concepts. So, should I go back and hammer down the S/D charts, or are the end of chapter questions closer to what I will experience on the test?