Overlearning
Overlearning is the repeated practice of a skill or study of material to further strengthen memory and performance. Rehearsal enhances performance past the initial point of learning because the neural processes involved become more efficient and recall speed improves.
Overlearning also leads to better performance in high-stress situations, for example taking an exam or performing in front of an audience, because what you’ve learned becomes second nature and requires less effort. So if you really want to master that Beethoven sonata you’ve learned on the piano, keep practicing it every day!