<P> There are substantial differences in funding , curricula , grading , and difficulty among U.S. secondary schools due to U.S. federalism , local control , and the prevalence of private , distance , and home schooled students . SAT ( and ACT ) scores are intended to supplement the secondary school record and help admission officers put local data -- such as course work , grades , and class rank -- in a national perspective . However , independent research has shown that high school GPA is better than the SAT at predicting college grades regardless of high school type or quality . </P>
what is the purpose of the act and sat
scores are intended to supplement the secondary school record and help admission officers put local data -- such as course work , grades , and class rank -- in a national perspective