What is the main conflict in Tom Brown's Schooldays by Thomas Hughes?

This novel tells the story of a rambunctious young student at a traditional English all-boys school in the mid 1800s, and his transformation from a thoughtless, shallow youth into a thoughtful, selfless, and moral young man. The narrator is as much of a character as the student, his schoolmates, and their teachers, giving the clear impression that the story is as much a lecture on proper behavior and morality as it is a narrative.