According to my mum who used to work w NESA now works w ACER:
arabic scales worse despite being the 2nd hardest language in the world bc only arabs take it
arabs grew up learning/speaking/communicating in arabic therefore its easy for them to get grades while other languages like chinese, latin, greek, german etc not onky natives do those therefore its ‘harder’ to get grades in them
scaling happens according to grades, more high grades the worse the scaling is, less high grades the better the scaling
thats why subjects like chem, 4u math, 3u math, physics, eco scale so well bc its harder to get good grades in them (good grades r defined as 85+) oppose to business studies, food tech, pdhpe - now health and movement science where its easier to get good grades therefore crap scaling