For all kids, healthy diet, physical activity, and sleep.
From a parenting perspective, I got a lot out of behavior therapy at KKI's outpatient center in Columbia, MD.
In terms of school, they already have someone they use for observations, but you may want to ask if they will allow a behavioral assessment, e.g.,:
http://cecp.air.org/fba/
It can help identify needed supports, which might be as basic as visual schedules, sensory break, etc.
From a social skills perspective, try one-on-one play dates. This is a helpful resource:
https://www.amazon.com/Its-Much-Work-Your-Friend/dp/0743254651/ref=sr_1_1?s=books&ie=UTF8&qid=1474575542&sr=1-1&keywords=it%27s+so+much+work+to+be+your+friend
If you haven't initiated the IEP process, you may want to consider doing this now even if you're moving. The process can take a while and it will probably make transitioning to the next school easier.