So Mao, despite the 2 mark difference, individual A would still get a B? :\ (for sacs)
I'd assume so
but there are a couple things to keep in mind also
1. statistical moderation is approximate, not exact
2. calculation of study score is irrelevant of grade, but rather the raw score [which we don't really get to find out]
if the two students have similar abilities (as demonstrated by the close tie in SACs), I would also assume that they'd perform similarly in the exam. that is, it might be a low A and a high B and are really only a couple marks off each other. the impact is not great, though it is a kind of reward for student B for doing well consistently for the whole year.
ReVeL: SACs are important, but not important enough to stress over.
It accounts for at max 50% of your score [SATs are different]. I have heard people say "I'm not ranking high enough so I can't get a good score", which is absolutely bullshit. Even if you have epically stuffed up a SAC, so long as you do well in the exam, you can still get a reasonably good score. [just saying this out loud, not in reply to anyone's post in particular]