The public school experience in the U.S. depends so much on your ZIP Code. I attended the best public schools in my state while my wife attended the worst in the same state. I am genuinely pro-public school, but there is a point where the benefit of being around different people is overshadowed by distractions and low standards. My wife had to be diagnosed with a learning disability in college to receive test accommodations when she discovered that you cannot stay after class indefinitely to finish an exam. Her teachers never raised any concerns about her taking 50% as long with exams compared to the other students, and she was the valedictorian of her huge urban high school. The lack of concern is bizarre until you consider that her teachers were preoccupied with students graduating and showing up to class. Many of her classmates ended up getting pregnant, and the school had a large daycare for the children of high school students.
My wife didn't end up taking the SAT or ACT because she attended a relatively strong local university with a full-ride scholarship and a test-optional policy. The MCAT exam initially denied her request for accommodations because she was only diagnosed with a learning disability in college. We successfully appealed by writing an essay arguing that my wife wasn't diagnosed with a learning disability in K-12 because her schools sucked (we submitted documentation that proved that her schools tested among the worst in the state, her elementary school was literally the worst in the entire state, when she was a student), and her teachers had much bigger concerns than why the smart, studious kid takes a long time to complete exams.
If the wife had gone to the K-12 school system that I attended, her learning disability would have been addressed in elementary school, and she would have been spared much angst. I was a very poor reader in early elementary school, and received almost daily one-on-one attention at my school from instructional aides and volunteers (mostly highly educated parents and grandparents) for years. I received a perfect score on the ACT reading section in high school.