I'm looking for course notes and assignments and hopefully some example exams for Discrete Math, I'm taking a placement exam in the subject after having taken it 4 years ago.
This is the discrete math course one in my school. It contain lecture notes, homework and previous exams. http://www.cs.sunysb.edu/~cse547/
When wanting to know about a particular mathematics subject, I often find that starting with the "further reading" section of the relevant wikipedia page is a good way in.
When it comes to textbooks, the Kenneth Rosen text Discrete Mathematics and its Applications is highly recommended. I was first introduced to it at my university, but I've seen it cited in several places.