Disclaimer: Sample exams are not real exams, they do not even tell you the level of real exams. They are only similar in structure with the real exams.
The problems in real exams will be similar to the problems you have seen in workshops and homeworks, as well as the clicker questions you have seen in lectures.
sample exam 1 , posted Feb 2, 2009.
sample exam 2 , posted Mar 3, 2009
sample exam 3 , posted