i say go for ittt then just drop if it gets too much. tbh science ext was one of the subjects that i studied the least amt for during my hsc period but it ended up raising my atar by quite a bit. idk if it was just my school but its VERY student led, teacher wouldn't show up half the time which is fine since its mostly your project that ur working on plus content on the side you have to learn (stats and theories and whatnot). id say that if u wanna give it a go then contact a uni or a research org from now to help u out with ur project proposal. since mine was med based, i emailed and called a bunch of professors, grad students and doctors (u can find their details online) to explain my predicament and more than one was happy to help me out. you got this!!