Ive heard nad is good from a few bodybuilders for brainfog and what you’re looking for. Also dihexa and pinealon have claims as well but ive never experimented myself.
Raw will power will be best as you forcing you brain to learn is linked to increasing grey matter in the brain more than anything ( also healthy habits) but start off with low does moda to cut out brain fog. Moda takes you to base line BBA has some pretty good videos on it 🫡