Sometimes i think i am not doing the things in the correct form, but then i compare the other pupils, from different classrooms and i calm down. I am sure that every children behave different with every teacher, so that's why it's important to know how to take control of the class, or to use the correct educational method.
Another importan point is the family, if family don't help their children, teachers will have some troubles at school or with some pupils in particular.