By all means it is good to set yourself a challenge piece, one that pushes you to that next level. However, playing such a piece for an exam may not be the best idea.
V. Horowitz: "Beethoven did not know the piano as well as Chopin."
Do you have a source for that?
Do you have a source for that?Frankly, if Horowitz did say that, he must have been on crack at the time.