Please keep in mind that I wrote in 2005, before the new standards book was published, but the testing method will probably be similar. The exam questions were a lot like the Schweser one where they give you a scenario with two people interacting, then ask which one violated standard x : person 1, person 2, neither or both. They might also give a scenario and ask if 2 standards were breached - again, using format: standard 1, standard 2 , neither, or both.
Last year the GIPS were WAY overrepresented, and the questions were on minutiae. They generally test new concepts much more thoroughly than older ones, or so I have been told. You may not see as many GIPS as we did, but I would say be ready for a lot of the research objectivity standards, which I heard have changed (I actually haven't looked at the new standards yet).
There will also be questions that are just plain difficult to judge. There is a lot more grey on the exam than in the text (at least the old text; maybe the new one is better ). I remember a question from last June that people were still arguing about 2 weeks later. Even with books in front of them, there was no obvious right answer.
Just study as much as you can, and accept that it is next to impossible to get all of the ethics questions right. Just don't freak out on exam day if you miss some, you can miss at least 30% and still do well.