Admission in Canadian Universities

I am a Canadian citizen and am currently studying the British Curriculum. I have received 4 a* and 4 a in IGCSE. I have also received 1a in physics and 3b in math, computer science and chemistry in my Advanced Subsidiary(As) exams.


1) Assuming that i will not be completing my A2 examinations and pursue no further secondary education.Basically i mean i will be applying only on the basis of As grades since most universities require 2 A levles or 4 As level. Which universities are my current grades competitive for in the following programs

i) engineering

ii) computer science

2) I will be giving some retakes to improve my grade for advanced subsidiary exams. Do Canadian universities accept retakes?

3)Would you recommend i also complete A2 or just apply in the basis of As