hi there.. hope this will help...
Credentials Evaluation Services or CES is an evaluation of your foreign nursing educaton done by CGFNS.it is not a test.
for nurses,usually the required report is "healthcare profession & Science Course-by course report" and you need more or less $ 278 fee to be paid to CGFNS. but to be sure, ask BON in your state what kind of report do they need?
to apply for this, you need to download the application forms from the cgfns web site
CGFNS International and the application handbook also, to help you for the entire process. good luck!