multigrade

/ˈmʌltiˌɡreɪd/
adjective
  1. Involving or combining multiple grade levels, especially in education.
    • The small school had a multigrade classroom where first and second graders learned together.
    • They developed a multigrade curriculum that works for students from kindergarten through third grade.
    • Multigrade teaching requires special skills to manage different age groups.
noun
  1. A class or school that includes students from more than one grade level.
    • The rural school operated as a multigrade because of low enrollment.
    • She taught a multigrade of 20 students ranging from ages 6 to 9.
    • In a multigrade, older students often help younger ones with their lessons.