Hey DD
I am just studying for that exam now. Doing self-study using the Rob Avery books (3 separate parts that cover the syllabus). So far I have found these books very helpful and easy to understand.
Quite a few people I know have done classroom courses for this exam and have found them quite helpful.
I'd suggest the best way to pass the exam is to dedicate 2 weeks full-time to really learn (either self study or a course) the material, going over it again and again if not understood the first time. Don't have any other major commitments during this time (definitely no going to work). Then have the exam booked in at the end of the two weeks so the material is fresh in the mind.