I first took the CEN in 1988 after my first two years as an RN--I had gone directly into the ED at a 300-bed community hospital in NJ. I kept it current until 2000, and went AACN for a Cardiac-Vascular certification with a job change to cardiac rehab. I returned to the ED in 2004 and recently got the CEN again. The test has changed considerably, and I must say for the better. I do best with study books that give questions and answers with rationale. I liked the CEN Review Manual-- see link below
http://www.ena.org/store/item.asp?IT...PARTMENT_ID=26
and would definitely recommend it. Get the book, it is worth the money for your professional development, even if you do not take the test for a while. It will function as a guide to show you what you do not know.
Join the ENA; that is an absolute must. The monthly journals are full of great articles, and the cost savings on ENA books and testing make the fee worth it. If I was starting again, I would opt for the lifelong membership (if you intend to remain an ED nurse.)
If your employer will not reimburse you for ENA membership or testing, do it anyway. It is nice to be paid for your certification, but it is better to know your job and stay current. Your patients count on you, and your co-workers do notice your commitment and will use you as a resource. Very few of the hospitals I have worked at will pay you a differential for your certification; they say it is part of your yearly evaluation and increases the percentages for your raise. But most will reimburse you the ENA rate if you pass the CEN.