Though Percentages aren't usually the 'real' indicators of a course. Theoretically, anyone can get HD.
Haha but if you grab ahold of the Stats of HDs, Ds, CRs, P, PCs for all UNSW courses, it usually shows how badly taught that course is, or how good it is.
Have to say though, if your course was organised really well, and the lecturers clearly expressed what they wanted you to know for the exams, then you're bound to get 65+