If your company is looking for you to get certified, I wouldn't waste time/money on the cbt's. Follow the advice from the other posts. Excellent advice. The self study kits from novell are also good. It gives you the nuts and bolts of what you need to know, but it still is not always enough to pass the tests. But in my opinion, they have been the better study guides to work off of. I wouldn't skip the labs. Do them a couple of times or until you are comfortable with what is being covered.
The next best thing might be to find a class or two. At least that way (depending on how qualified the instructor is) they should be able to point out how you might use this option, function, command, etc in the real world. Not just for the test.
Good luck