The Sri Lankan Ordinary Level (O-level) is a General Certificate of Education (GCE) qualification in Sri Lanka, conducted by the Department of Examinations of the Ministry of Education. It is based on the British Ordinary Level qualification. An O-level is a qualification of its own right, but more often taken in prerequisite for the more in-depth and academically rigorous Advanced Level exams. It is usually taken by students during the final two years of Senior secondary school (Grade 10 & 11 (usually ages 15-16)) or external (non-school) candidate. The exams are held in three mediums Sinhala, Tamil and English.