You can use the Quiz Properties for a quiz in your Presenter '09 presentation to branch a user to a specific slide in the presentation based on their quiz results (pass or fail). Here's how:
1) In PowerPoint, select the quiz slide.
2) Click the Properties button.
3) When the Quizzes and Interactions dialog opens, edit one or both of the following Quiz Properties by selecting any of the available options from their corresponding drop-down list:
4) Click the Close button.
5) Publish your presentation.
Here is a video screencast of this process: