Anectodically speaking, it has always been extremely helpful not only reading texts and solving problems/exercises, but also: 1) repeating topics out loud and,

Anectodically speaking, it has always been extremely helpful not only reading texts and solving problems/exercises, but also: 1) repeating topics out loud and, if there were some formulas, writing them down while doing that 2) explaining something to your friend if they didn't understand it