I am new to this as my son is only 5 and just started school but can you call/email the principle and ask to setup a meeting with her/him and the teacher? That really helped us get things in motion for my son. Parent teacher conferences would be a hard time to get everything across you need to. If I were you I would focus on a quick overview of why you feel you need a indepth meeting and try to schedule one at that time. If you have a whole list of concerns I bet you won't get through one or two before times up. I would start with a compliment about what you like about the teacher and what your son enjoys in class then state you have some concerns that he is a child that may not be displaying his full capabilities in class and you would like to meet and show her some examples and come up with a long term gameplan to help him be the most successful he can be.