Is there anything I can do to get temporary orders at least so he doesn't miss out on 2 months of school which is crucial for him?

Our son has been in my district for public preschool with an IEP for the last year and his mom wants him to go to her school for the last year of preschool throughout his school years. I don't agree as he has an IEP/speech delay and changing in the middle of preschool would not be in his benefit. Also, he is in a grade A school and mother is in a grade C school district. We had our resolution management conference on Monday and the judge is sending us to a parenting conference with a mediator. Conference is set for July 29th and he starts school the 22nd. If we don't come to an agreement with mediation, how will a 3rd party help us come to a decision and won't he go to school until after the court hearing on September 10th? We got him in preschool so he is kindergarten ready and now he is being set up to fail because she won't put her son's needs before her own. He is not in daycare at all during the week when he is with me as I have off during the week and only work weekends. If he were with his mom for the school week he would be in daycare all day since she works Monday to Friday from 8am-5pm. How is that spending more time with him when she would only get to see him for 3 hours each night if that because she still has to cook dinner, do homework, get him ready for bed and so forth? When I have all week off to spend with him, work on his homework, go to the park and other places, volunteer in school, take to doctor’s appointments and so forth. I just don't get it. Either way one parent is going to lose time no matter what because she moved an hour and a half a way!