Scoring System

Hi all, 

I am new to all of this but my son is undergoing assessment for possible high functioning autism. I received a letter today with the following scores; 

school - Cambridge 83/141, CAST 17, DSM 5 21/66

home - Cambridge 104/150, CAST 22, DSM 5 37/72

Can anyone help me decipher these please? I have tried to google but am having no joy. TIA