It's wrong to bail on an academic obligation.
Mr. Smith could see that Andy was doing poorly in Algebra, so he offered to tutor Andy and Andy agreed to it.
Andy wants to get better at Algebra.
Andy stays after class and gets taught some tips on how to learn Algebra better by Mr. Smith.
Andy decides to study Algebra on his own so that he doesn't have to spend too much time on it.
Andy is better able to do well in the class, and he learns a lot.
Andy ends up getting a substandard education and continues to do poorly in class.