yeah I do have the brown and green books, it's thick but half of it is exercises which you don't have to do all of them. comparatively it's the best cos it really makes things clear
I know it's obviously not in the syllabus but I'm just interested and don't get this Product rule - Wikipedia, the free encyclopedia (how do they come up with the rectangle?) and the one in cambridge.
but atar means your rank in all the hsc candidates in state i.e. higher atar=higher rank=more courses available etc.
also median is not the average, it's like the number in the middle