I had read to "study" the DSMIV and other hooey like that. Totally not applicable.
Know the basic characteristics of the common diseases, then know how to tell acute stress disorder from PTSD, schizophreniform from schizophrenia and brief delusional or brief psychotic disorder.
Probably more important to discern a delusion from a hallucination, know when someone needs involuntary admission.
Very important were drug reactions and non-psych causes of mental wierdness were common (thyroid, wernicke's, cushing's, pheo, Huntingtin's, TLE, CJD was there I believe).
When to get an MRI vs CT vs EEG vs LP. I'm not sure if the LP was on there actually.
Know how to treat and identify benzo vs. etoh w/d.
Know illicit drug intoxications.
Know the PD's.
Know the difference between conduct and ASPD, Bipolar I/II.
Some ethics Q's I most likely got wrong.
Child psych d/o were key (~10-15 Q's), free points for pervasive, Rett's, Autism, conduct, bulimia and anorexia were definitely there, know the PEx and labs for the eating d/o's THEY ARE COUNTERINTUITIVE and cannot be "figured out" (by me) from 1st principles.
And last but certainly not least conversion d/o vs malingering.