I hope you have been reading during fellowship...because I heard it's a hard test.
from what I know, read about:
wind up theory, gate theory, opioid receptors, NMDA, urine drug screen,
sympathetic/autonomic innervations/blocks and their side effects/complications,
opioid receptors, brachial plexus innervations, brush up on your drugs and their side effects, definitions of disability, somatoform disorders, malingering, chemicals/neuroendocrine mediators
If I were you, I will do the Raj's questions and look up stuff that you don't know. Sorry for not being more possitive about it....because I really hate it when people tell me, "oh, don't worry about it, you are smart, you'll pass..." Study hard and good luck.