The way we do education is based on fundamentally flawed concepts, from the grading systems we use to the clear design towards specifically (neuro)typical and more privileged children. This is just true everywhere. Childhood psychology/developmental psychology and education are pretty complicated and poorly understood by most of the public, even educators. And obviously significant social biases also play a part in the education system.
Rich kids without ADHD generally do far better in school and get into far better colleges or professions initially than poor kids or kids with ADHD... there are exceptions, but for the most part, almost all of the kids that fail school either have some form of disability (often times an undiagnosed disorder) or are underprivileged in some way (like being poor). Generally those kids would excel in a better environment, hell usually the "gifted" classes are primarily neurodivergent kids in elementary/middle school (or equivalents).
