Use RemNote & Anki.
Both are programms/apps, which use specific learn methods like Spaced Repitition and Active Recall to improve your learn progress.
RemNote is better to take notes but both programs create flashcards, and after one repitition you must give an feedback on how good you‘ve memorized the flashcard (bad good or perfect) - then the system will automatically classify your cards. It‘s a very good tool and there are a lot of YT videos about them, too.

Repetition. Having someone challenge you on it afterwards. Thats how i got through college.