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This was the best advice I had. Not from the school but from some behaviour management person.
There has to be a consequence for every time the students do not meet my expectations and there has to be a reward when they do.
A defined reward system where the students get a good text home or a phone call home if they get their name on the board several times has worked a treat.
I knew it would work when one of my worst behaved students said ' That's the first time I have ever had my name on the board for a good reason' and she worked even harder to get her name on again.
That was a better outcome for me, she usually called me a 'c*ck' and threw her pencil at me.