Support with emotions/changes at school

Hi all, I'm really struggling to support my son at the moment. The school have agreed he can have a laptop in his public exams, but this means he will need to use one all the time in his lessons now. He doesn't understand why even though I have clarified this with the school, and is really upset about it, headbanging and crying. Please, does anyone have any tips on how I can support him at this time?