A review course is often hard to find. There is one coming up at the conference in Austin Texas on October 24. You may want to check out ASTNA.org to see info on the conference and the test. Good luck this is a difficult test. From experience and being a CFRN I flew for 3 years before I took the test. You should be profecient in ICU, ER, trauma, peds, neonate, gas laws, safety and legal aspects. Hope this helps. The ASTNA will also refer you to reference books, but there is nothing like good ol' experience. Good luck in your endeavors