It's kind of a cheat on my part but I will likely only have either FL 1 or FL 2 before mine.
BUT .... I voided last year so I kind of know what to expect but still had to re-study everything (I voided solely because of psy/soc...)
How many to take? Depends really on how confident you are after the AAMC materials (SBs, q-packs, flashcards, etc).