My difficult child has behavioral problems also. We had a neuropsychologist exam to rule out delay/diabilities. I am not sure if it is the same as a pyschoeducational assessment. At our testing difficult child was in one room, while I was in the waiting room. It laste several hours and breaks were given. A few weeks later we were presented with a report that basically told us what we already knew, no disability or delay. We did not get much out of it, but it was another avenue to pursue. Also when we did it, he was not yet in school. As for the IEP, my difficult child is now in Kindergarten and has several interventions in place. He has his own para, takes movement breaks and has a behavior plan that he follows daily. It has helped a lot.