education

my son was diagnosed last october at the age of 12 (yes it has took us years to get there) anyhow he is now in mainstream highschool and finding it very difficult so attendance sitting at 58%, i am trying to get him in a special school but keep hitting brick walls. he has support in school and teachers saying that he is coping but that is not the impression i am getting from my son. my son is not dissruptive so seems to go under the radar. i am looking for advice as to how i fight this or should i be fighting this. i hope i,m making sense as i am new to this thankyou