Ask around and see if the examiner has something published about their checkride. A few here have DVDs they put out of what they "Expect" you to know on your checkride. Basically they put their checkride oral on DVD. It is not exact, but I'd bet it is about 75% accurate. Others have a comprehensive list of questions that they use--if it is on the list they are fair game. The list is 200-300 questions long, but if you know it you can't go wrong.

Take a few seconds to think about and formulate your answers before you give them. If you don't know an answer say "I don't know it, but if you give me a couple minutes I can find it." I said that once, the guy asked me where I would find it, I said AIM and he said good enough, let's move on.

Big thing, relax! Good luck and try to enjoy yourself! You would not be there if your instructor did not think you were ready! Don't forget to sign your temporary when you get it!