Microsoft Office 2007 Qualification - Expert Level

[VulcanX]

Hi there all,
I just wanted to ask some questions relating to the Office 2007 certification + qualification.
I read that I need the MCAS and also read on Microsoft that you get 3 levels to it, Specialist, Master, and Expert. How do I go about getting the Expert qualification. I am very new to Office and want to self study. So i would like to ask your expert opinions on which books I should use.
I found the following Microsoft Press books and unsure which will suit me for Word and Excel in particular (as this is what my company wants me to study).

http://www.microsoft.com/learning/en/us ... en-us#tab4

http://www.microsoft.com/learning/en/us ... cale=en-us

http://www.microsoft.com/learning/en/us ... en-us#tab1

http://www.microsoft.com/learning/en/us ... cale=en-us

If I need more than one book that is fine, I just need to get qualified and become very good with Excel and Word.
Thank you for your assistance and enjoy your day.