<p>Well you can certainly look at the exercises (you mean the ones they have at the end of each chapter?) but I think they are ususally different from the sort of questions you get on the exam - I found that they ask for more calculations, because you have plenty of time and they are testing the concepts they just taught you. On the practice exams they have more realisitic questions with less calculating to do.
But for sure, study the chapters if you need to brush up on some concepts!</p>
<p>I would advise that you do as well as you can on the practice tests, but don't get too discouraged - they are much harder than the real exam.</p>