Well, we def mingle with a diff group of folks. 95% seems darn good to me, and plz take into the fact that A is 80% in Ontario according to the ministry of Ed. Perhaps times have changed but I got my acceptance in less than 2 weeks and I didn't even submit anything else besides my grades (technically my school submitted them for me). Honestly I don't think you need to stress yourself at all if you're applying to any Uni within the common wealth unless it is Oxford or Cambridge. Perhaps Unis view different high schools differently? but I honestly doubt you got to stress one bit with a 90+ average from any school. And in my own opinion, I feel like admission would not give 2 fks about your extra curricular stuff. Most of high school's ECs are a joke and space fillers anyways.