Each house has associated House Captains (usually one boy and one girl), along with a Head Boy and Head Girl (School Captains) and their Deputies that can be chosen from any house. Prefects are expected to perform various duties such as monitoring hallways etc.
In each residence hall, there are designated House Captains (typically consisting of one boy and one girl), along with a Head Boy and Head Girl (School Captains) who can be selected by the other houses. Prefects are responsible for carrying out various tasks such as monitoring corridors, etc.