Babies can’t wait!

Hey guys so my son is 2 And we finally have an evaluation set up for a couple of weeks with babies can’t wait. He is two years old and he doesn’t talk the only thing he says is mama. He had tubes and he was younger so the doctor say he’s just a little behind he goes to daycare just about every day but we’re having lots of problems he just started biting he will do that when he’s excited or mad. They say he doesn’t play with the other kids much and likes to play by his self... We do not have that problem at home he plays fine with his brother and his brothers friends and his cousins... I have tried to work with him so much at home and do things that streets therapist have told me to do nothing seems to be working my question is has anyone went through babies can’t wait with their toddler and seen improvement? They will be doing it at the daycare so I will not be there I’m just wondering what they are going to do that I haven’t done I know I’m not a professional and I know there’s things that I haven’t done it’s just hard to picture please let me know your experiences❤️