Anyone considering a checkride in the near future should be completely familiar with the FAA's Practical Test Standards. These PTSes spell out all of the knowledge and skill an applicant may be asked to demonstrate.

Note that all of these files are in Adobe Acrobat format.
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Recreational Pilot Practical Test Standards for Airplane and Rotorcraft (1989)

Private Pilot Practical Test Standards for Rotorcraft Helicopter and Gyroplane (April 1996)

Instrument Rating Practical Test Standards for Airplane, Helicopter and Powered Lift (October 1998)

Commercial Pilot Practical Test Standards for Rotorcraft Helicopter and Gyroplane (April 1996)

Flight Instructor Practical Test Standards for Rotorcraft Helicopter and Gyroplane (April 1996)

Flight Instructor Practical Test Standards for Instrument Airplane and Helicopter (March 1990)