<p>"I'm sorry to sound like a total idiot, but what the hell is a double cohort?"</p>
<p>Until recently, Ontario students graduated high school after grade 13 and then attended 3 years of university to earn a bachelor's degree. Students from other provinces or countries who entered Ontario universities after grade 12 were accepted into a "Qualifying year."</p>
<p>A cohort refers to students in the same year. When Ontario decided to eliminate grade 13 and have their students graduate high school after grade 12, they ended up with one year where both grade 12 graduates and grade 13 graduates applied to and entered university in the same year. Hence "double cohort."</p>