The eleven-plus (11+) is a standardised examination administered to some students in England and Northern Ireland in their last year of primary education, which governs admission to grammar schools and other secondary schools which use academic selection. The name derives from the age group for secondary entry: 11–12 years.

A grammar school is one of several different types of school in the history of education in the United Kingdom and other English-speaking countries, originally a school teaching Latin, but more recently an academically oriented secondary school.