Theres never a good time for art or anything you want to do. School these days is made to make prime worker drones and office fodder and not much else. You have to make time or do your Art whenever you can, in short: You gotta suffer for it. It sucks but there is always an answer to it. Maybe ask the smart ones if you can copy their homework or get a parent to help you out with it.
There is always a solution you just gotta be able to go through with it.
Yatsufusa
Speaking from an adult(?)'s perspective, most workplaces don't encourage creativity either.
If you want to do anything creative (or even artistic) you will have to do so in your spare time, while trying to balance every others aspect of your life at the same time. Terms like 'struggling artist' and 'starving artist' don't get coined for nothing.
The only "easy" ways around that is essentially being born rich, so you don't have to care as much about personal finances - or living a rather ascetic life in a tent in the wilderness. If that's any consolation that part will get better once people realize how much the world would be improved if we killed the people in power of the big companies who treat their workers poorly and try to bleed their customers dry - while complaining that _their_ business practices had negative consequences on the entire world and asking for tax deductions.
So I guess what I'm saying is: "Let them eat 'the rich'." :)
But since something important and helpful like that never happens if only small groups complain, your best bet in the immediate future is to draft an open letter, put it on a clipboard and try to collect signatures from your fellow pupils during the breaks so the school brings the art classes back. People have to vote with their feet though. Every signer would have to commit to switching to 'Art' if the school were to bring it back. It's a bit late in the semester, but with some luck they'll pencil it in for next year.
Other than that... A transfer to another school would be 'a' possibility, but how feasible that is would be dependent on how well your local means of public transport are. Plus, it will eat a lot of your spare time traveling.