Seriously guys, by the time the HSC comes around you will be so sick of waiting and preparing for it that if you end up having all your exams in one week, consider yourself lucky.
Put it this way, all mine were in the first week bar one: Ext English, in which I had a week break.
By the end of the first exams I was just so over everything (and so close to the end!) that I honestly didn't put as much effort into Ext as I did my other subjects, even though I had the longest time to prepare for it.
Basically you just have to deal with what the time table gives you, and remember everyone's in the same boat.
If it gives you lemons, use those lemons to create a piece of writing in which they come to realise a discovery of self through an inner journey, or you could write an experiment in which you outline the procedure you studied neutralise the acid in the lemons (Showing all relevant equations, of course).
Whatever, I'm tired, leave me alone.