study minutae. he loves detailed explanations of characteristics and procedures that other people might not cover. know the FARs, know the UND opspecs, know the AFM and the airplane limitations. understand ANDS and UNOS even though you're not an instrument student.
oh, and if you're not a staunch republican, just ignore the GOP propoganda and rush limbaugh items in his office. if you're a republican, you automatically earn your PPL, -IA, -ME, CFI, CFII, MEI, and ATP-unrestricted with this one checkride.