Just a thought regarding your final paragraph about the good lessons ... what struck me as different is your confidence. If you are having these behaviour problems, then when you do have those good lessons, your confidence must soar and this is evident in the way your lesson works out. You feel good, confident and successful and students respond to that. Focus on what is working well in those lessons, are they the ones you feel really prepared for, are they the ones you really know your stuff about, are they lessons which you feel excited about the content or the approaches you have planned to teach something? I think as a student teacher, often it is evident you are new/ you don't know it/ you are learning and ultimately it's a scary time, a time when you may not come across as confident to your class and they will pick up on this. Heck, I'm an Early Years teacher and even my kids would pick up on that when I was training and on placement. So be confident, know and tell yourself, 'I am the teacher' and 'they are the students'. No matter how they behave, they are students, kids. And you have power. Believe it and you'll be amazed at how differently they react. Fake it till you make it. Assume confidence. Assert your power as the teacher, especially with such difficult behaviour in class. You have already been given some great advice about being firm and consistent, I particularly like the term 'brutal'. I have fairly good behaviour in my class, but when they do step over the line, they KNOW it. I make it very clear. But if you are trying to follow this advice, behaviour management strategies and sanctions, without really sounding confident about imposing these sanctions, it will be obvious. Next time, make it clear in a firm and confident voice the sanctions that you will be imposing should X happen. When it does, immediately stop and follow through with confidence. Ignore others. Don't go back outside to get them. Leave them. Get on with the lesson as if nothing had happened. In fact I would go as far as to say tell them exactly how disappointed you are with them with regard to their behaviour and that this is a new start for sanctions. You will not tolerate it anymore. It is not acceptable. And follow through. Love the idea of positive strategies such as 'Students who have impressed me' rather than names of those who have not. There are most definitely kids in your classes who do want to learn and will help you once you gain a little more control. Enjoy the positives, learn from the negatives, think critically, know it will get easier, and fake confidence and authority if you don't feel it yet. Good luck. Let us know how you get on.