What should you do it you've tried everything and the problem persists? Keep trying! There is a way to improve every behaviour problem! Sometimes the solution seems impossible to find and you will really have to think outside the box! As one teacher said "It's all about finding the right carrots and the right sticks!" Face every behaviour challenge as a chance to learn and grow as a teacher and you will surely do just that! Remember that you are not alone and that other teachers around for to listen, help and share ideas and experiences! No one has all the answers so don't be afraid to ask for help!