Obviously no effort would mean studying the day before or something, but in general he didnt care at all and still got 65, he had already paid his $1000 to tafe and then found out he got into uni with 65!!!
Needless to say though, dont go in thinking you dont have to study at all and you will go well. How many days left till da HSC, like 9, start hittin da books hard now and you should go reasonably, provided you hav some idea wat your talking bout. Btw, i got 79 and 1 unit of 2U mathematics was counted, SOMEHOW from getting 30% as an in class mark it got scaled to like 60%! Jus an example of how scalin can help alot...altho it can be bad to.
Also, try not to freak out to much, I remember one guy who was really smart, like studied heaps, went really good in junior years but when he hit yr 11 and 12 he struggled....the stress had a real bad effect, some ppl just cant handle it. I attribute my ok UAi to bein calm, I was personally resigned to going to tafe, and it was a pleasant suprise to get into uni. Moral of story, its not the end of the world, there are other avenues and keep your options open.
Simply put - stay calm, study, and jus take it easy n dont freak out.