Tutor for a child with ADHD

I need a tutor for a child who has been diagnosed with ADHD. It is difficult to teach him on my own. At school, teachers try to help, but it's hard for them to pay enough attention. I need a teacher who understands the characteristics of such children and has experience working with them. The main thing is not only to explain the material, but also to choose methods that really work. Perhaps someone has already been through this and can recommend a good specialist or effective teaching methods?