Same here, apparently it’s a major ADHD thing. I can take notes or I can pay attention and try to understand, but I can’t do both, you have to pick one (a calculus teacher in high school was very insistent that constant note taking for her rapid-fire example-heaving lectures was required, so… yeah I didn’t have a clue WTF we’d even been covering after each of those classes, though I’d have lots of notes!)