I'd ask the therapist about group therapy with other kids his age. It's been a massive help to my son. The boys get together once a week and the therapist gives them a task or a problem to solve. They then have to work together to accomplish it. He helps supervise and re-direct where necessary. It's basically a mini-version of what happens at school, but under the direct guidance of a trained professional who can step in and help the kids understand why the other child is frustrated, or why do they feel anxious, or whatever.

~amy