grading scales

At some point recently the grades for Musical Acoustics were posted, meaning in the past 48 hours.

This bothers me.Edinburgh Uni has a student population just over that of UVA's, the EU exams were earlier, and it was three weeks into the second term before I heard back about ONE of my grades. I am "unimpressed".

However, for an exam in which I studied the absolute minimum amount, I must have done well. The grading systems are not directly relatable between the two, somehow the same work will get a different mark between the US and UK grading schemes, and I'm not exactly sure what each looks for.

For comparison, 70% is an A, and 40% is passing.
I think that the UK grading gives an "actual" percent. If there are ten points to cover, and you only successfully explain half, that's a 50%; my experience with US grading has been that you might get full-credit for those half and then some amount of partial-credit on the rest, for maybe 70%. Good estimations I suppose in retrospect, those are both C's... I think.

Point is, I'm just as baffled about grading after a full term as I was when I first began. I guess everyone else is too, which is why my grades don't transfer back home, only the credit earned.