My advice for the exams would be don't over think the questions and know which man pages have examples you can gain experience from. :) Interestingly the pass rate isn't as high as I would have thought.
Ha! I heard a story from someone back in 2001 that a company sent twelve of their staff on a complete RHCE course, that is, through the basics all the way to the RH300. Only 2 got passing grades but not enough to get the certificate (things were a bit different then...it was a three part exam consisting of MC, Troubleshooting and Installation/Setup).
If anything, this is a good thing so we do not get paper RHCEs.