You need to get to the bottom of it. Talk with him and his teachers (maybe to his friends too) When you talk with him don't ask him why he doesn't want to go to school (he obviously doesn't want to tell) Ask him other questions about his days in school and how things are going.  Usually when kids don't want to go there is an underlining problem he's trying to avoid by using excuses.  I don't want to speculate, there are many possible reasons. a common one is bullying, but it could be many other things.  I hope that you identify the problem soon and that things will get better.