The written exam is the standard AMR pre-employment test. Approximately 100 questions all multiple choice covering just about everything, much like an EMT class final (although a tad easier).
Skills test (at least for me) was a scenario which required you to perform several different skills (Trauma assessment, Spinal Immobilization, Splinting, etc). I'm not sure if it's the same test all the time, but just think of it as a NREMT skills test all integrated into one scenario as opposed to being in different stations.
Be prepared to be asked random questions orally such as "Starting and ending at the right atrium tell me where a drop of blood goes when it travels around of the body" or "What is the difference between CHF and COPD?"
If you more than barely passed your EMT class then you should be fine, but if you've been out of school for a while be sure to brush up. Not really rocket science.