Middle schools, or junior high schools, are schools that span grades 7, 8 – and sometimes grades 5, 6 & 9 – which straddle primary and secondary education. Upon arrival in middle school or junior high school, students begin to enroll in class schedules where they take classes from several teachers in a given day. The classes are usually a set of four or five (if foreign language is included in the curriculum) core academic classes (English or "language arts," science, mathematics, history or "social studies," and in some schools, foreign language) with two to four other classes, either electives, supplementary, or remedial academic classes.