- Edited
oat Hi! I'm in year 11 (in WA as well) and I started the year with 6 ATAR subjects (english literature, maths methods, chemistry, human bio, french SL, and music). I went into the year thinking that I would drop either french or music for year 12, but I'm halfway through the year and am dropping Human Bio for a study period (I am doing AMEB music exams, which count towards credits for your WACE, so some schools allow students who do them to have a study period instead of doing another subject).
Although I love human biology (I'm hoping to get into medicine), I found that ATAR human bio is quite difficult compared to year 10 (the extended responses are harder to get marks in, there is a lot more content and you need to know all of it). It ended up as my second-worst subject for this semester, so it wouldn't be counted towards my ATAR anyway. It is a very content heavy subject, and I definitely underestimated how hard it would be. I find chemistry relatively easy, but I enjoy it so that probably helps (I definitely don't study it every day though).
As @chocomilkenthusiast said, chemistry is probably going to open more pathways than human bio. If you need human bio for a pre-requisite there are usually bridging courses or extra units you can do in uni (eg pharmacology at UWA), but it's a lot harder to catch up on chemistry in uni (for example, chemistry is a pre-requisite for medicine at Curtin but human bio isn't, and I don't think there are bridging courses for chemistry for this degree).
As for the workload of doing 6 ATAR, I found it not too bad until exams, and then I found it very overwhelming and hard to manage.
If you think you could try to do 6 ATAR in year 11 (even if you treat one as a 'general' subject and don't put much effort in), I would recommend that, as you can try all the subjects out and see which one you want to drop after doing them, as your choice might change (like mine did). Even if you end up dropping one after a week/term/semester, I think at least trying all of them would be beneficial. If you can't/don't want to do that though, I would probably drop human bio (or chemistry if you are sure that you won't need it for uni). Definitely keep doing HASS subjects, it seems like you really enjoy them. Just curious, if you do 5 ATAR, what would you do for a 6th subject? You could always do Human Bio general (I've heard it's a lot easier, and I regret not choosing it). I would also recommend seeing if you are eligible for a study period in year 11 (some schools won't offer them to year 11s unless they have external influencing factors like high level sports, music, illness, etc), as having a study period would definitely lighten your load.
Sorry for the long response, I'm a lit student lol. Hope this helps