I know people are always looking for studymaterial for Office 2010 exams. As with older version there will be a studyguide available. So here is the one you have all been waiting for: http://oreilly.com/catalog/0790145306159?green=22327582247&cmp=af-mybuy-0790145306159.IP
I did not use this book for preparing for my exams simply because the book wasn’t published when I took my exams. So if you did use this book let me know what you think of it as a material for prepping for one of your exams.
Important Update: I have read some reviews from people who bought this book. It seems that the companion content link in this book is incorrect. The publisher knows about this error and has fixed it. I don’t know if your copy will have the new link but just in case here it is: