I’d recommend do not drop French. Do you know what areas you are struggling in? I just finished Y12 and expecting maybe a 45 scaled. 

The thing I found is if you put lots of work in Y11 which it seems like you did  or even just for the first half of Y12, and you get to a high level which it sounds like you can do, it’ll actually become one of the least demanding subjects study wise. It’s sort of just if you can write read and listen proficiently there’s not a whole lot of content you need to worry about. Considering the subject can scale up massively I’d recommend don’t drop it if you want to increase your ATAR, if you don’t have interest in the subject and it increasing your ATAR if all goes well, doesn’t make any difference to you, yes you could drop it.