GD question

My girlfriend is due three weeks after me - she just failed her 1 hour test. Now I know that usually people pass the 3 hour test, but she scored really low the first one - she was off by 20 points. I don't know what this means really. How 'off' is 'off'? For those of you that failed the 3 hour test, how off were you? I think she said something about hers being at 160 or something like that when it's supposed to be at 120? Or maybe I have that backwards?

Just wondering if anybody has that kind of specific information!