Once again - it is all documented - go look in the Practical Test Standards on the FAA website for the Commercial. It details ALL the requirements of the Checkride and permitted tolerances.
To be honest - for a FAA Commercial certificate - you should really know all this like the back of your hand.
You will be tested quite thoroughly on your knowledge of the FAR's during the ground portion of your check ride. Fail the ground portion and you will not get to the flight test.