The document discusses co-curricular activities, which supplement the standard curriculum. It defines co-curricular activities as those undertaken alongside academic work that help students learn life skills like cooperation. There are 13 types of co-curricular activities that can support different kinds of development, such as academic, aesthetic, cultural, emotional, and more. Examples provided include debates, dance, drama, field trips, science fairs, and scouting. Teachers should take an active role in organizing these supplemental activities.