Passing the Exam
Obviously, this exam will require that you know more than just the activities to setup directory services. You'll need an understanding of how AD can and should work around an existing business model.
When you are ready to start the exam, take a deep breath, and try to relax. If you've already passed the four core Windows 2000 exams, this one shouldn't be too tough for you. Keep a mindset of how Microsoft and the "suits" would look at network design (think dollar signs), and you can make this exam almost as much fun as playing with cars in your sandbox.