We all get a little more stressed at this time of year with the pressure of exams and folios to be completed. Concentrate on the groups who need to get their controlled assessment pieces finished. Once you have that together you will feel better. I am not sure when your groups go on study leave but it can't be long after this Easter break, so really you have only this week and 2, maybe 3, weeks left to prepare your students for their exams. Which means they must already be at a good stage as you have been preparing them since year 10 really. It is a very stressful time of the year for teachers but it is also a very short time and it will be over very soon. As for your year 9 group - I work with EBD and SEN pupils and I have seen every type of behaviour they display. If you want to message me privately and give me an idea of exactly what your struggling with I'd be more than happy to offer any advice, help and support. But don't do anything rash like handing in your notice or trying to escape - like you've stated - you've no idea what another school will be like, it could be the same or worse and it's better the devil you know isn't it. You're lucky you have a sympathetic HoD too. Hang in there!