CPEN

Sounds like you're using all the available resources! I checked the ENA website to see if there was a sample CPEN exam, because that was helpful for me as far as gauging my preparation for the CEN exam, but there isn't one available yet. There are some (non-ENA-endorsed) prep courses listed on the ENA website here: http://admin.ena.org/bcen/cpen/ReviewCourses.asp -- pretty pricey, though! One of the CPEN review course websites appears to have some additional resources for sale, like audio reviews. The exam is just so new!