Starting the Conversation
Contact the school to schedule a meeting just before the beginning of the school year, or if that doesn't work out, wait for the second week of school (the first is often too busy). During your initial conversation, give the teacher your phone number and e-mail address, and let her know that you're always available to talk about your child and the challenges he or she faces.
Talk openly with the teacher and use constructive language that doesn't present your child as a problem. For instance, "He does better if he's sitting toward the front of the room" is better than "He just doesn't listen and I don't know what to do with him."
Also, find out how much the teacher knows about ADHD. This can start a discussion about what strategies the teacher has used before and what might work best with your child. You'll also be able to get a sense of whether the teacher is flexible and open to accommodation suggestions.
No matter how the teacher treats you or your child, treat her with courtesy and respect. Making accusations or being confrontational is likely to backfire. If you expect the worst, you set a negative tone from the beginning.