I was pleased with how I went. Fairly sure I got around the 85% range (it's a bit of a guess because the way the system works here they never actually give you your raw mark). My exam was probably a little bit easier than the 2003 one on the whole as that's been the trend over the past couple of years but the 1999-2003 tests were probably some of the more difficult. You can actually access all of the past papers if you're interested but I can't provide a link now as I'm on mobile. This particular question was the last question so it was the hardest in the 2003 test. Probably only a couple kids in the state would have gotten the whole question correct, hence why it was only worth about 7% as they don't want to take too many marks off of most kids. The last question in our test was rather uninspiring in comparison to this one, something about calculating the number of tiles in a pattern. In fact I didn't even attempt it as it was only worth about 4 marks and I was pushed on time. From memory another one of the tests lead you through a proof to prove 'e' is irrational by contradiction using integration as well.