While I have not taken it, from all the posts, it does look like a very challenging exam. In the exam feedback section, there are four different posts from people who have taken it; please follow this link:
http://www.instantcertonline.com/for...sent-clep.html
If I were you I would postpone the test until I studied thoroughly from the suggestions in these posts, took some practice tests, and had more confidence in my preparation.
Please use the search function, I know there have been many different discussions concerning this test over the last year; they are sure to add more information. Good luck and let us know what you decide to do. Lee