My grandson is I think a High functioning ADHD - I think that's all correct terminology. He's 10 years old. On the surface he is fairly good at school, maths in particular he is v good. His reading is also excellent but his comprehension of what he has just read is terrible. I'm looking for worksheets or other educational aids which would enable me to help him - preferably free. Can anyone help/point me in the right direction? Thank you.