Lacking these school leaving certifications, in some states potential students can qualify for university entrance if they present additional formal proof that they will be able to keep up with their fellow students. This may take the form of a test of cognitive functioning or passing the "Begabtenprüfung" ("aptitude test", consisting of a written and oral exam). In some cases, students who do not hold the Abitur may enter university even if they do not pass the aptitude or cognitive functioning tests if they 1) have received previous vocational training, and 2) have worked at least three years and passed the "Eingangsprüfung" (entrance exam). Such is the case, for example, in Hamburg.