Hi,
70-667 exam validates the skills needed to configuring SharePoint 2010. You are already working in SharePoint Administrator, it means
you have a good knowledge of SharePoint 2010. What I want to suggest you to not to lose your concentration and confidence. Learn the objectives covered in the exam, understand the concepts, and you will crack the exam in your first attempt.
Check this link to get information about what percentage of the test each topic covers:
http://www.microsoft.com/learning/en/us/exam.aspx?ID=70-667#tab2
Thanks!
Aparajita Community Manager at uCertify http://www.ucertify.com/