<P> The Ontario Academic Credit or OAC ( French : Cours préuniversitaire de l'Ontario or CPO ) was a fifth year of secondary school education that previously existed in the province of Ontario , Canada , designed for students preparing for post-secondary education . The OAC curriculum was codified by the Ontario Ministry of Education in Ontario Schools : Intermediate and Senior ( OS : IS ) and its revisions . The Ontario education system had five years of secondary education , known as Grade 13 from 1921 to 1988 ; grade 13 was replaced by OAC for students starting high school ( grade 9 ) in 1984 . OAC continued to act as a fifth year of secondary education until it was phased out in 2003 . </P>
<P> The Ontario Academic Credit or OAC ( French : Cours préuniversitaire de l'Ontario or CPO ) was a fifth year of secondary school education that previously existed in the province of Ontario , Canada , designed for students preparing for post-secondary education . The OAC curriculum was codified by the Ontario Ministry of Education in Ontario Schools : Intermediate and Senior ( OS : IS ) and its revisions . The Ontario education system had five years of secondary education , known as Grade 13 from 1921 to 1988 ; grade 13 was replaced by OAC for students starting high school ( grade 9 ) in 1984 . OAC continued to act as a fifth year of secondary education until it was phased out in 2003 . </P>
when did ontario get rid of grade 13
when did ontario get rid of grade 13
1988
1988