I bought a book from CSI Coding Strategies, Inc. called CSI Navigator For Invasive Cardiology 2010 Edition. It covers Cardiac Caths, Coronary Procedures, Peripheral Angio, and Peripheral Interventions. It was a little expensive but it is wonderful. It explains things very clearly and gives you 40 op reports to code and an answer Key. I thought it was worth every penny as I had no problems with any of those things. You still need to know stress test, echos, EP, etc. On my test there were several questions re NP's. The test is pretty well rounded covering all bases!
Where are you taking your exam?
Good luck,
Susan