Inish dear, let's not cherry pick. And for the record, I agree with Maths, it's indeed possible for you to get a high range score simply from acing the exam. But this isn't what i'm disagreeing with. It's your generalist claims that I find a bit annoying.
But even if you didn't, let's look at your case in German.
3 marks out of 50 --> 24 marks out of 400. They're weighted the same, remember?
You also seem to be under the misconception that 310/400 is 90 marks from first. Let me enlighten you here, with languages that have essays, it is impossible for you to get 400/400 or full marks. The examiners will always deduct marks from even the top range essays, it's inevitable. But i'll just file that under lack of experience with languages and that's perfectly fine as that.
Most subjects are weighted out of 75-100 mark exams, so really, after expecting to lose 3-4 marks at the very least, the max will only be around 380/400. 24 marks out of a 70 mark gap from the exam means huge influences by SAC grades.
If you end up with a scaled SAC score of 0 and an exam score of 100, you'll end up with a weighted average of 50 which is less than a raw 30, theoretically. Obviously this scenario is not very plausible but we'll keep it here for comedic value.
Note that you cherry picked German. For a language like Chinese Second Language, the difference between the 1st student and someone near the 80th percentile is around 45-50 marks/400.
The difference SAC wise is 3 marks/50 = 24 marks/400.
If every SAC mark could affect 8 marks/400 on the exam, that would have a substantial weighting on your end score, given 8 marks/400 is the difference between a 45 and a 50.
There goes your theory of 'who wins the exam, gets the cake'.
And before you go implying that i'm not maths literate, check your calculations first
Note:Nothing personal, i just felt a bit riled at your veiled accusation.