I'm a huge advocate of practice exams. I do them for every class, so that by the final I already know how I would approach a question about pretty much any topic that was covered. One of my profs actually offered to look over practice exam answers and provide feedback. I took him up on it, and he said I was the first person who ever did. I got the highest grade in the class on that final, and I think it was because of the preparation I did. Know the rules and understand how to apply them efficiently. What else can I say?