Premise 1: Connecticut suburban schools are stronger than most schools in most states.
Premise 2: The SAT (and ACT) is a national test.
Premise 3: Those in the top 10% of schools such a Guilford High School, Daniel Hand High, Lyme-Old Lyme High School, East Lyme High School, Old Saybrook High School, Valley Regional High School (Essex-Deep River) and a whole host of other public schools in Southeastern, CT have battled competition far stronger than most students throughout the country in order to land in the top 10%. At private schools, those with As at Xavier, Mercy, The Williams School, Hamden Hall, Hopkins, among others, have earned As that equate to the same exact GPA as those at who earned As at schools that are terrible.
Premise 4: You might think that colleges have a fail proof system to account for these scholastic differences. Not true! Most larger universities feed numbers into an academic index with almost no adjustment for strength of school. Smaller liberal arts colleges have a better sense as to the strength of the school. But here I have to report to that most everyone outside of Connecticut does not know how to differentiate the strength of a town’s high school. Madison, CT might mean something around here but not necessarily to those who are reviewing applications for Haverford or Swarthmore or Pomona or any other none New England liberal arts powerhouse.
Conclusion: The SAT is the only way to differentiate students from these schools across the country.