Make-up class refers to the activity process that students need to make up classes after missing classes due to sick leave, personal leave or public holidays. Make-up class refers to the activity process in which students' academic performance does not reach the ideal height during normal classes, but most of them are required by the Education Bureau or schools, and teachers are paid to teach. Make-up lessons also refer to the phenomenon that some schools privately increase 1 to 2 classes after school in order to increase the main class time.