Senior Certificate, noun phrase
Also with small initials. The formal name for matriculation (sense 2). Also attributive.
1955 A. Delius Young Trav. in S. Afr. 37If you want to get a decent job of any sort, or go to a university, you’ve got to get your standard ten, that’s matric. or senior certificate.
1970 Daily Dispatch 11 Dec. 6Umtata’s Hoërskool Transkei will be able to offer English higher to junior and senior certificate candidates next year.