They keep students 'noses out of comic books, improve their school work, and give Dad a quiet evening for a change. The only bad thing for me was that the writing on the board got blurrier every day.
補習的歷史，想必由來已久，它可避免小學生沈迷漫畫書、讓家長有清靜的夜晚，讓大家功課進步，皆大歡喜。