I don’t know about other colleges but UC’s do their own calculations or averages to determine if you are in the top 9% of your high school. My school doesn’t rank but when i submitted my UC app, I got this message under application status:“According to UC calculations, we have determined that you are not in the top 9 percent of students at your high school.” I assume they determine the top 10% gpa from the school report or average of all applicants gpa from your high school to the UC’s.