It's how the grades are weighted here. A "C" is a 2.0, while a C- will be a 1.67 or so. Accordingly, an "A-" is not a 4.0, but an A+ is above that level. You will meet some individuals here that will never get below a 4.0 for any given semester while they are here. In addition, classes are weighted depending on how many credit hours they are worth, so getting an A in a class like MA204 which like like 4.5 credits will help your QPA more than getting an A in MS class worth .5 credits (or the converse is true, hence why you will often see low GPAs for plebes and yuks who must take many math and science courses which tend to be very credit hour heavy).