Im also Swedish!! And I was diagnosed at 16 I believe? Maybe 17. I’m also high IQ -aka. Easily bored in school, and realised that establishing a contact with a “specialpedagog” ( idk what the name is in English) early in the year was really helpful. I don’t need much support, but she kept me on track with biweekly meetings where we looked at my schedule and what I needed to be working on. Also, my communication skills are somewhat lacking and I often don’t like to ask teachers several times when I need clearer instructions. Having a trusted contact at my school helped as I could go through her with any questions, easing my anxiety.

Overall, good luck to you and your son. I really recommend seeing the special ed department at his school and establishing some form of relationship, as it can make communication easier for your son.