Quick Question About UC Admissions (not a chance thread)

Hi,
I had a quick question about some of the UC policies. I was reading on their website that for some courses (i.e physics) if you take the SAT subject test for the subject it satisfies a full year of taking that class as long as you get a 550 or something or higher. Does this mean they will count it in your gpa, and if so do they have some equivalent grade scale based on the SAT score or some other system?