If you have a competitive system that determines a significant portion of your life, people will find every advantage they can. Currently, getting into T20s and performing well in them is a large predictor of future success; this means every advantage students and families can find, they will take. This article doesn't touch on law school, where accommodations gaining is likely more prevalent (I've seen anecdotes supporting this but not full research) because a fixed portion of the class gets As and you need to outperform peers as opposed to just do well. The easiest way to fix this and make education more meritocratic is to standardize college admissions into a single test (such as the way China, Japan, Ireland or Türkiye handles things), because wealth is less effective at gaming test scores as opposed to the rest of an application (see the MIT SAT decision). You'll still see people finding advantages once in schools, but it'd be less prevalent than today.