Schools have different missions, offer different grade configurations, with different curriculum and pedagogy. Some are highly competitive by design, others intentionally nurturing. Some focus on the arts, others on math and science or outdoor education. Some are for the gifted, others are for the average range or for a special needs population. A rural boarding school for 150 students may have a vastly different approach to education than a city day school of 1,500.
Independent schools are different from each other.
To rank or rate them is a de facto labeling of vulnerable high school students and is inherently wrong. I know that schools want to give parents all the information necessary to make informed decisions, but objectively rating or ranking schools on a handful of criteria gives the wrong information. Look at the college rankings. And I know that many college administrators have knuckled under to the rankings game, spending inordinate time on boosting statistics in some U.S. News categories to get a higher rating, even giving the magazine suggestions on how to modify the research design. I say no.