Don Mills Collegiate Institute (DMCI) is a high school in the community of Don Mills in Toronto. It serves an ethnically dive ... rse student population of approximately 1000. As of 2017, 67% of students speak a first language other than English. The school opened in 1959. Don Mills has been consistently represented in the International Math Olympiad, International Physics Olympiad, and the DECA International Career Development Conference. In addition, the school has also performed well in chemistry competitions, including the University of Waterloo's Avogadro and Chem 13 competitions, as well as the Canadian Chemistry Olympiad. Recently, Don Mills has also performed to a respectable degree in biology competitions, including the Canadian Biology Olympiad and the University of Toronto National Biology Competition, with students moving to national finals for the past two years. read more