[hhjinks]

I've never had a concussion, but I wanted to recount my similar experience in school, too. Like you, 5 minutes of math lectures had me dozing off. Really, a lecture in any subject would bore me to sleep. Only when we got practical tasks to work on, like math or physics problems, did my brain wake up and engage with and understand the material. As a result, I excelled in the natural sciences and math, where working on problems took up most of the time, while I did poorly in the more memorization-oriented social sciences and language subjects. Memorization is a skill like any other, and I'm happy I get to work in a field where understanding is more important than memorization.