norm-referenced
/ˌnɔːmˈrɛf(ə)rənst/adjective
Assessed by reference to an empirical norm; specifically (of a test or examination) having performance criteria based on results previously achieved in it by a chosen sample of subjects, rather than by independent or absolute standards; marked or scored in such a way that predetermined proportions of candidates achieve the different grades, regardless of how they perform in absolute terms.
Origin
1960s. From norm + referenced.