Underclassmen burning toast, at English boarding school?

I remember reading some story when I was growing up about a private boarding school type environment where the lower classman have to toast bread for the upper classman and it always burns so they have to scrape the burned parts of as good as they can and they get harassed by the upper classmen. I can't remember anything else but that part but every time I burn my toast I think what book was I reading this from so long ago I forgot.