Metacognition — What do(n’t) you know?	William Wieland
Pianists are tempted to play what they know well. (I often hear the same music coming from practice rooms.) However, we must practice the difficult and/or unfamiliar passages, i.e. what we don’t know.
Memorize “backwards”. First memorize the last phrase, then the second-to-last phrase, etc.
Take charge of your own education.