The key word in the PAST acronym is ABILITY.
Definition: Ability Tests
An ability test is a test to check an individualís ability to perform a certain kind of job. It usually tests the individual for certain skills or whether he is capable of acquiring those skills in the course of the job or through training.
Generally occupational physical ability tests have a pass score or a go/no-go at the lowest possible level and a top score of average.
I cannot address occupational physical ability tests of AFSCs other than pararescue as they were not developed specifically for the AFSC but adopted from pararescue or US Army airborne course or Ranger school prerequisites.
The Pararescue PAST standards had two strong needs for being developed and implemented. The primary purpose is a test to check an individualís ability to perform a certain kind of job. The second purpose connects directly to mission readiness and mission availability. This has two concerns: 1. Is the individual sustaining minimum fitness once trained to perform duties and the second has the person recovered sufficiently after treatment of significant injury or treatment of significant illness to be put back on status to perform duties.
The point being is for selection/screening course and selection and screening training purposes the physical ability test should be considered as a test to demonstrate your best ability rather than the minimum ability.
If you slack off after getting through training your supervisors and teammates will know quickly enough before you even fail the required annual occupational specific fitness test. Failure of that test is generally the last piece of documentation to remove you from the AFSC.