Well, you can't go wrong studying the PTS. Our local examiner goes right down the PTS and checks off each section as he goes.
Also, do the following to stay prepared:
1. Study part 61 and part 91 and AIM. Use a highliter to mark the sections/information that apply to you.
2. Study the PTS and make sure that you can "discuss" each topic for several minutes.
3. Know your POH, systems, performance, etc.
4. Daily, do practice written test questions - especially if you have a computer based study guide such as Gleim, etc.
5. Have a friend(s) fire volleys of questions at you.
6. Get a gouge for the examiner you plan on using. I have found that most examiners stick with a "schedule" that they have used forever.
These are some ideas......