I think that each of them would keep their exam marks, but their SAC marks would change depending on how well the person in their position does. For example, the first ranked person would keep their A, but their SAC marks would drop down to what position their own exam mark was in. In your case, this first person got the third highest exam mark, therefore, they would lose their original SAC mark, and get the SAC mark of the third highest person (which doesn't really make much difference from the looks of it).
I believe that the other 10 have a relatively equal playing field in regards to SAC's and the exam, but will not really affect the people with the excellent marks. This is why prestigious schools always seem to get those high study scores, because nobody does badly on the SAC's, and therefore, if they lack confidence in the exams, then their SAC marks don't get affected much, if at all in some circumstances.
Lol, tell me if I am right or wrong.
