Unit 3: 96/100
Unit 4: 96/100
(Apparently unit 4 is weighted higher?)
And exam marks: 10/8/8?
Nah Unit 4 is weighted the same as Unit 3 - 25% each.
I think you'd get a SS of around 43-45 with that 
Meep really? Even if I'm ranked highly in a strong cohort?
My friend who's gotten the same wants to know what if she gets full marks on her exam?
If you're ranked highly in a strong cohort, then you're SAC marks should get moderated up!
And by the way, if you're friend got full marks in her exam, she would get a 50, as long as her SAC marks are in the A+ range

But mind you, I have NEVER heard of anyone getting full marks in an English exam; I've heard of people getting 50s with losing a couple of marks.