Register for the exam, then you get all the study material that's available.
Except for these papers, you should:
- have quite some experience with PowerCenter (in particular mapping design),
- read the respective manuals.
only one a question more, at what manuals do you mean?
The PowerCenter manuals that you can download (either one by one or in one ZIP archive) from the My Support portal under the heading Product Documentation - All Documents.
Sorry that I can't provide any better proposal here.