Universities can adjust for grade inflation. For example, a Waterloo, the Engineering admissions department compares high school averages to first year averages

Universities can adjust for grade inflation. For example, a Waterloo, the Engineering admissions department compares high school averages to first year averages to see how much scores drop, and use that to compute an adjustment factor by school (the logic being that if your marks dropped more than average, then your school was probably inflating your mark from the "true" mark you deserved).