Some old exams from other instructors:
Christopher McMurdie:
Practice Final (Solutions)
Practice Midterm (Solutions)
Midterm (Solutions)
Practice Midterm 1
Midterm 1
Practice Midterm 2
Midterm 2
Practice Final
Final
Christian Rudnick:
Midterm and solutions.
Final and solutions.
practice midterm
Archive of old exams
Here are a few more for good measure.
(Notice that most are not on a 2 midterm schedule.)
Nathan Grigg:
Winter 2011 Midterm 1 exam and answers
Winter 2011 Midterm 2 exam and answers
Winter 2011 final exam and answers