Does that study control for school quality? If grades are normalized for a local school population, then good grades at one school can be worse than mediocre gr

Does that study control for school quality? If grades are normalized for a local school population, then good grades at one school can be worse than mediocre grades at another school. This was exactly the purpose for which tests like the SAT were created. If that factor wasn’t controlled for, then the quote above is misleading.