Question

the advice you would give then all to behave better

Answer 1

These students lack manners which should be taught to them and they should be warned about the language they use.It should be noted that whenever they use foul language just complain to the teacher.
It will be good to advice him that using foul language in the school is not allowed and you will be punished if you do so.If still he does not stop then last way is to call their parents and ask them if his behaviour is same as here at home.If it is founded to be true then he might need pasychology treatment.