yeah as someone who dropped art three months into year 10, it is defo a decision you need to think abt lots. like the person above has said, it requires a major amount of extra time. my friend told me she dedicated more time to art than all her core subjects combined. its even worse when ur a perfectionist like me, which is why i had to drop it and pick up something else
if you are talented in it tho, and unfortunately i do mean like a natural talent, you can get away w spending ever so slightly less time. if you do end up taking it, make sure you go to all the open studio sessions and stuff to work on ur art more. also stay organised with your time. if you have a lot of out of school stuff going on, i don't recommend taking it
you may also find it helpful to talk to ur art teacher abt the course and the different sections of it and how much freedom there is and if you have opportunities to do what you want essentially.
if u do take it up, good luck. it defo was fun while it lasted and i dont regret doing it one bit - i literally ended up finding my best friend looooool