Wow, you got both authors of all of the SCJA book on the market to reply! Isn't JavaRanch awesome!
I think Robert's point is a very good one. If just one book was all you needed to read to pass a certification, the cert wouldn't be all that valuable. You'll need a few resources. The SCJA Guides, both mine and Roberts, are just that - Guides. They'll help you out a heck of a lot, but you've still got to put in a great deal of effort, and using multiple resources will really help you grab a top notch score.
I always recommend that people also grab a programming book, whether it's a first year Java course book from college, or even Head First Java, just so you can work on syntax and your programming foundations. This exam doesn't go as deep as the
SCJP exam as far as syntax goes, but you do need to have a firm grasp on your loops, conditionals and Java foundations.
-Cameron McKenzie