View attachment 48950
Very insignificant scaling difference when compared to History. Chemistry is much more content heavy compared to physics and more time dedication is required to memorize the stuff which isn't easy either since you also need to understand the abstract content.
And if your goal is 99 atar, you probably are aiming for 95 hsc mark for your subjects. If you don't manage to get in the 95+ mark range, scaling does become more important. It becomes even more important in the <90 range as you can see in the graph where a low mark in a bad scaling subject such as history is very detrimental.