I hated French. Trust me - I hated it much more than you. It was such a boring lesson that had no point. However it is good to know another language when trying to get into Universities and getting other jobs so I suggest you stick at it. Half three is when most people leave school isn't it? I dunno - anyway, don't take 'legal' action because it won't go anywhere but get your teacher spoken to by the head of year/head of school/head of subject, etc.