I used BRS psych, read through it twice (each chapter is pretty quick especially after thowing out all the behavioral/historical stuff at the end), and still had enough time to make a quick reference sheet for all the little things that I'd forget (ex. number of months needed before I can make the dx., etc.). Also did Pre-Test, which I love regardless of discipline, and ended up with 89% on the shelf.
DEFINITELY overstudy rather than understudy pharm - I had at least 25% of these. Admittedly, that can be a daunting task given all the drugs, however the drug questions that did appear on my exam were pretty straight - if you had studied the pharm. Pre-test does a nice job hitting the pharm high points across most sections.
Good Luck!!