Affinity, were u at parra library on friday? I saw someone with the letters W-E-A-K on their jersey and thought it might be you, then you are too leet, so i didnt bother coming up and asking, I would just shame myself :D :p
Heres a couple of sites if you don't want to search :)
http://www.straightdope.com/columns/030110.html
http://en.wikipedia.org/wiki/Leet
That should be enough to arm yourself with the history of 1337 :p
Looks like from previous years, a mark of 70/84 in 3u, and about 75/120 in 4u will achieve the highest band, +/- 5 marks :D, of course it depends on the paper.
I think I wrote two for change, and that's it for the hsc, but during the year, I think i've written about 5 :), I don't know how you can write so many essays, or maybe i'm just too lazy :D ;)