na the hsc is no longer ranked based. it is now purely based on the performance of yourself. there are however slight impacts on your mark becasuse of the marks of the cohort around you ie your class mates. in 1994 exactly 10% of students received a uai of 90+. in 2004 about 17% of total students received a uai of 90+. the hsc is getting easier and easier every year. some ppl reckon its coz the government wants people to think that the education system in australia is getting better.