When selecting who to accept for the Multimedia major (single major), do they only look at your MMEDIA1A03 and MMEDIA1B03 marks or will they look at your other marks as well? Specifically I want to know if they'll look at my CMST1A03 mark.

Admissions are based on overall average. You just need to achieve a certain grade in the MMEDIA courses.

I got 11s in both MMEDIA courses. I have one 11's from first semester and one 10 from this semester. The other courses I'm not so sure about but I'm positive it should be at least 8-9 (unless I somehow failed my exams).

I'm just worried about my CMST1A03 exam which I'm sure I'm not going to do so well on. As of right now most of my assignments have gotten 80s but my midterm was 66% and I'm sure my exam will be around the same (if not worse).

So, you met the minimum requirements for your mmedia courses, now all that matters is your overall average. No course is weighted more than any other.