We have 4 years of highschool, starting from grade 9 and up to grade 12. Ontario used to have 5 years, as they had a year following grade 12 known as OAC which was supposed to help supplement a year for college/university, but it was changed to 12 years like everywhere else about 4-5 years ago.
Its 5 years Junior high is 8,9 and 10 and high school is 11 and 12 .
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