no they dont in the way that you describe ie with a single question. however like some schools moderate sacs/tests if the whole class does badly over the whole test (ie the mean is like 40% or something like that, no one above 60% or something) and they shift the whole thing up, well in a way vcaa dooooes kinda you could say do that, when they divide the study scores over the curve giving the 0 - 50 study score distribution. like if it was horribly hard, there will still be 50s except they'll be achieved through scores of like 85% instead of like 95% or wahtever if you get what im talking about. but its not the same thing as what you asked. so. no. aha.
either way. this is nothing you should even be thinking about as it really has nothing to do with how you approach the exam or how you go, or anything you have control over
eta; waht im trying to say is, it really wouldnt matter if they took that question out anyway, because all it does, is improve your percentage score yes, but it rarely changing the ranking since barely anyone got it right. and seeing as ranking, not actual raw percentage, is what matters, seeing as you are allocated a study score depending on how you go in comparison to everyone else, it really wouldnt mean anything. at all. except be unfair to thsoe who did get it right.