I'm approaching the end of my first placement, less than three weeks left. But I'm burnt and stressed out. I spend most of the waking day working and planning for my five different classes. Four of them go okay for the most part, but one has me at my wits end. They're very low level (subject = English), the entire class feels like riot control. I can't get them to stop chatting and chat to people across the room and at different tables. I absolutely dread going to school because of them and it's totally putting me off teaching. I was off sick today with a bug, and I was glad. Throwing up in the toilet at home was preferable to teaching them. What can I do?