head girl
From Longman Dictionary of Contemporary EnglishRelated topics: Schoolhead girlˌhead ˈgirl noun [countable] SESthe girl who is chosen in a British school each year to represent the schoolExamples from the Corpushead girl• By all accounts Selina was a bright child who ended up as head girl of her secondary school in Guisborough near Middlesbrough.• I was made head girl there and captain of the senior hockey team.