“Top Six” refers to the six senior (12U and sometimes 12M) Ontario high school courses that are averaged (with equal weighting) to determine your “university admission average” (like a GPA) by Ontario universities.

Which courses/grades are included in the Top Six?
Your Top Six average is calculated based on a combination of required and elective courses and your individual admission average varies from school to school, and even from program to program!

When you apply to an Ontario university, the admissions department will receive a list of your grades for all courses at the 11 and 12 level, but they don’t initially see all of those grades. Your academic transcript is reduced to a single admissions average by a computer calculation that takes into account only six of your Grade 12 courses at the “U” or “M” level.