The Leaving Certificate Examination (Irish: Scrúdú na hArdteistiméireachta), commonly referred to as the Leaving Cert or (informally) the Leaving (Irish: Ardteist), is the final exam of the Irish secondary school system and the university matriculation examination in Ireland. It takes a minimum of two years' preparation, but an optional Transition Year means that for those students it takes place three years after the Junior Certificate Examination. These years are referred to collectively as "The Senior Cycle." Most students taking the examination are aged 16–19; in excess of eighty percent of this group undertake the exam. The Examination is overseen by the State Examinations Commission. The Leaving Certificate Examinations are taken annually by approximately 55,000 students.