Hi,
I've taken the JB336 and not the exam ;-) and I have a quick look to the 'study guide'.
I think there will be nothing involved that is only teached within the course. It depends to the interest of people within the course what part is very deep discussed and what part is only addressed.
So I found the course topics in the study guide and if you familar with all these things the exam should not a problem.
I suppose the exam is similar to the course practice, you will find a JBoss installation (more or less wrong configured) and you have to correct it.
Difficult might that part which you never deal in real life with.