As suggested by others also like marcus, johannes - Mock exams should be part of the study. They really help you same time helping you learn fast and better.
I've been using exam simulators for quite a long time and feel they are really worth it. They dont just help you pass but much more.
J@Whiz has been talked a lot at this place and specially there new version is great. I believe their Customized option, Quiz and Explanation quality is highly worth it. You can try with their demo version, dont remember the exact url.
Once again i will favor exam simulators like jwhiz, as part of your study for any certification.
Best wishes for your exam