Hey all, I just passed my CCRN (with a score of 111/125) and thought I would share my method of preparing.
I started studying a little over one month before the exam (while working full time) using the Educational Enterprises DVD - CCRN Review Cram with Laura Gasparis Vonfrolio. Once I made some headway into the DVD's I began using the CD that came with Pass CCRN by Donahoe Dennison. I took quizzes and read the rationale until I felt that I could comfortably complete quizzes with at least a 7/10 if not an 8/10. You will find many of the quiz questions to be very helpful for taking the CCRN. I did not find the need to take any 150 question practice quizzes. Be sure to take plenty of quizzes from the professionalism and ethical practice, as Laura does not touch on this area. Bottom line: as long as you study the Review Cram and do quizzes, you'll do great!
Best of luck!