Actually, it is very easy to retain anonymity, but BOS would quickly be shut down by the board of studies if exam questions were leaked, there'd be several legal issues. The administrators of this board run it with the object of helping students, not facilitating their cheating.
You guys need to get over it....you've all done trials and at least one HSC exam, you should know by now in the 2 minutes or so the papers were sittting on the desk, you could not possibly read a question in detail, let alone read the CHOICE of questions you get.
And guys, the questions are exactly the same thing rehashed every year, if you've studied your past exams and read the texts, knowing the general question a few days in advance is NOT going to help you adversly AT ALL.
Advanced students should not be this dumb.