Scores on the PiCAT are created as a composite made up of the scores in particular sections, and represented as a percentile.
The scores from the first four sections are presented as a percentile and must achieve a minimum of 31 to be accepted into training for the army. If you have a GED, the top minimum score for Air Force careers is 65.
Each role has a composite minimum score; if it is not achieved, then your application will not be taken forward. The best way to guarantee your pick of roles is to perform at your best throughout.