as an adhd haver myself i honestly cant see how someone can go through high school without it being noticed. i was diagnosed as an adult but i’ve been struggling tremendously in school since sometime around 5th grade and it did not go unnoticed. i think a lot of ppl being diagnosed as adults are ppl who have something else thats “wrong” w them but their symptoms just happen to overlap w adhd and they end up getting misdiagnosed, aaand that some them are just “normal” ppl who happen to be a bit like ppl with adhd, without actually having adhd themselves, which is completelyyy possible, its not like adhd traits are completely non-human-like qualities. lets take forgetfulness, completely human!