Here there are exams from the present term as well as past terms. They are presented here "as is" along with their keys. Usually I change my exams each time I teach a course, but old exams can still be quite useful for additional practice. Some keys contain a graph or other kind of picture that was created with TikZ and/or PGF that might be of interest to others who are working with those LaTeX packages, in which case there is a link to the (more or less) minimal "code" needed to generate the picture.