To be honest, Albert was not particularly fond of the teaching profession, nor was he very willing to waste his limited patience on Hogwarts students. However, he had always been a very responsible person; knowing that he messed around at Hogwarts while enjoying so many privileges, he naturally did not want to let down Headmaster McGonagall and end up leaving her with a mess.
Therefore, teaching this year's graduating class well was very important to Albert.
Many people only look at the results, but...
Chapter 1546