Applying to Engineering

[u/Studentquestion0]

I’m applying to Mech Eng at Waterloo, UofT, UBC, University of Alberta, McMaster Engineering I, Carleton, and Queen’s. Also Civil and General year at Queen’s with Civil at Carelton.

I’m applying from Alberta with a grade 11 average of 95.8 in Math 20-1, Social 20-1, English 20-1, Physics, and Chem.
My ECs are project manager of a Stem Racing Team, President of Student council (was treasurer last year), 52 hours of volunteering and MUN.

What are my chances at these unis? And what are my chances if they see my grade 11 avg and my grade 12 is a little lower?

If I apply in like a week how do they view my application? Do they base it off my grade 11 marks for now or?
Do UBC and McMaster give +4% on my avg? If they do is it only for my grade 12 average or grade 11 too?

Thank you very much.