Do as many practice exams as you can (I also purchased Rob Avery's after doing the AFT online practice exams). That way you'll get an idea of where to focus most of your study time when preparing for the real thing. It's probably one of the easier ATPL exams once you know where to look for the references. During the exam, even if you think you know the answer, look it up anyway in the appropriate sections of the CAO's etc.
The hardest part about the exam is carrying all of the reference materials up the stairs to the exam centre. I actually brought all of them with me in a small suitcase.