There's more to it than just "taking the test." You have to have at least 2,000 hours of clinical practice in psych nursing and at least 30 contact hours of continuing education related to psych nursing within the last three years in order to be eligible
to write the exam. The point of the certification is to document that you are competent in your specialty
When I took the exam many years ago, it was v. difficult. I had been a full-time psych nurse for two years and had put a lot of effort into preparing for the exam, and there was still stuff on the exam I had never even heard of
Here is the ANCC website, which has all the info: http://www.nursingworld.org/ancc/index.html
Is anyone in your agency actually an experienced psych nurse? (The way you worded your post, it sounds like you are not.) If the agency wants to make more money by admitting psych patients, maybe they should hire some psych nurses ...