In other countries like Finland, they have it right compared to US education system the genius W contributed to breaking: homework has no value, teaching answers to excessive standardized tests (NCLBA) has little value, and grading teachers on immediate performance of said standardized tests has little value.
To solve this problem of finding good schools, I believe word-of-mouth advice from more successful folks is more valuable than any website filled with sour grapes or unverifiable claims made by random, anonymous people. It also can be a problem that better areas tend to have better schools, so no website will be able to find what doesn't currently exist in low population or not-as-nice areas.
There are websites like USNAWR who attempt to rate K-12 schools, private and public. https://www.usnews.com/education/k12