Microsoft is again offering folks two chances to pass a certification exam. This includes Dynamics certifications exams. Register on their website first, then take the exam. If you fail, you get to take it a second time for free. See Microsoft’s site for details. The key seems to be that you have to register for this offer BEFORE you take the first exam.
Hurry up though, this is only good through January 30, 2008.
Two Chances to Pass a Dynamics Exam – Limited Time
Archived post from 2007. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.