What mark is 70% when talking about grades (high distinction, credit, etc,...)
Distinction.
You do have to remember that these marks are much more difficult to get than at high school: an HD (80-100) is the equivalent of an A+, I'd say.
Oh, that sucks.
... Is the system similar, such as a D would be 65-79 and so on? (I don't know how to explain it? :S)
I don't get what you're saying.
Anyway, the scoring system at ANU is:
HD 80-100
D 70-79
C 60-69
P 50-59
F 0-49
Though if you get 45-49 sometimes there's the opportunity to sit a supplementary exam. The scoring system is the same at Monash I think, and the same at Melbourne only they call them different things for some stupid reason.
It's hard to compare uni grades to school grades because there's no clear relation between the two - I have friends who got over 99 for their ENTER, for example, who "only" get Cs for their law subjects.