The preparations I took was first reading the HFSJ, and then reading it again. The mock exam at the end is a good reflection of the real exam, except that on the real exam they give you the number of answers.
I also bought the Whizlabs software but I wasn't very satisfied with this. The level of the Whizlabs questions was much higher than the level of the real exam, and a lot of topics that are not in the exam objectives do appear in the Whizlabs questions. And I wont mention their spelling...
I also did the preview exam of Enthuware, and that seemed to be a better comparison to the real exam, so if you want to buy something, I would consider the latter.
So succes to you all, and thanks for all the help I had from the forum.