Crying, frustration and why?

Since last Thursday Max has been crying at school on the days he goes to the math class. Max loves math and enjoys telling you math facts.  I can't understand though why he is crying. I have been communicating with his teacher and she can't put her finger on it either. 
The last couple of days I have been worried about how he is going to handle junior high.  Next year he will start seventh grade at a new school, new students and new world for him.  I have this desire to capture him and place him in a enviroment where know one can hurt or say things that will make him feel like he is of no worth.