I went to a small school so a lot of people didn't get their first choices for subjects because of the time tables. If you aren't prepared to retake the year you might have to make some sacrifices. Just got with whatever option you think best. if you can;t decide, chose two options, flip a coin between them and if you are happy with the outcome you chose it, if you are unhappy with the coin toss you know which option you'd rather take.
I hope it goes well