If you’re assigned something to read, read it aloud to yourself. This engages not just your brain, but speaking and hearing, and your brain makes stronger pathways when more senses are engaged.
Don’t buy flash cards, draw them yourself. This engages sight and abstraction.
Write your own notes, then read them aloud and highlight them yourself. So many parts of your brain make connections by doing this. Don’t just read. That’s not very helpful, you don’t have to study long if you study well,
I think there’s a name for this, but I’m tired and will rely on Cunningham’s whatever.
Completely unrelated answer, but my way of reading better is writing and drawing on the score, specially the parts that are harder to remember or play.
I see many people reading scores from tablets and that won’t work for me.
Slightly related to the topic, do an improv or make up harmony for what you’re playing. Because that’s stimulating your creative brain, which doesn’t get a big work out if you’re just playing what’s written. Btw in baroque times it was standard to play harpsichord and have a proper time for improv/solo. Classical and romantic music killed that trend.
More related to the topic, shake/headbang or the closest thing to moving/dancing you can do while playing. It’s going to be challenging next time you play flight of the bumblebee.