Hi William,
I know of quite a few people who have passed the exam without taking the course. Everything that is in the exam is mentioned in the study guide and it is all based on the available documentation. If you have good experience with JBoss administration and you can do everything outlined in the guide without using the Internet, you should have no trouble with the exam. BTW - the key phrase here is "without using the internet". The exam is a closed envorinment so you can't rely on external help like Google or these forums.
I would stilll recommend that you take the course if you can - it gives you a concentrated update on the skills and knowledge needed to administer Jboss as well as giving you four days away from work to study and prepare for the exam. You definitely don't need the course but it does help.
Regards,
Greg