marine, the PRT counts for 1/3 of your final PE grade. The other 2/3 is based on your PE class grade. If you have a semester when you have two PE classes (boxing/wrestling), each class counts as 1/3.
xchefmike, validations are possible for every swim class and highly encouraged. Your very first swim class will be the validation test. Unfortunetly, I don't remember the validation times (I sucked at swimming so I didn't concern myself with those). However, I can tell you the distances:
4/C - 200m swim
3/C - 400m swim and 10m jump
2/C - "The 40 year" - Validate by swimming 1400m under 40 min
The min validation times will earn you a 80% B in that class.