I just passed the Cardiac Vascular Board Certification last week. I didn't study for it and having done it couldn't eve tell you the best topics to study.
I found it to be a very touchy feely test. Lots of therapeutic conversation and behavior models, many outpatient cardiac rehab questions. Not really as much inpatient cardiovascular nursing as I would have liked. The test plan online gives the impresion of more acute care questions.
Also, they don't give you a score or a breakdown of how you did in the areas of the test.....just a pass or fail.