If i could track down one of my report cards i could tell you what they stand for by my school. they are listed at the bottom. also use the +/- systems. As for our GPA its on an 11 point scale which is really hard to get above a 9 for anybody even though there are people with A's and B's in everything.
As for graduation requirements they have gotten out of hand. must have 40 credits to get even a state diploma. not to hard but with all the courses they require to be within that 40 credits it makes it hard to fit any elective classes in. we only have 5 classes a day but are on trimesters. With vocational half a day i only have 3 classes. but vc also amounts to 8 credits a year and possible certifications

Also the state tends to standardize test us out the a$$. even had one in HISTORY of all subjects

:-/