We moved here (Alpharetta) over 9 years ago and our number one priority was being in the best school district.
My kids (1st grade and 5th grade) go to Dolvin Elementary and we couldn't be happier.
I also researched the GA Pre-K program pretty extensively so if you would like some insight on that too please let me know.
Being in real estate I'm very knowledgable about the Alpharetta (and surrounding areas) and can tell you that you won't go wrong with most schools in Alpharetta. For the East side of GA400 I'd recommend: Dolvin, New Prospect, State Bridge, Ocee, Barnwell, Lake Windward, Abbotts Bridge, Creekview, Shakerag and/or Medlock Bridge.
As long as you stay with either Autry Mill, Taylor Road, River Trail and/or Webb Bridge (for the East side of GA400).
The best high schools are: Chattahoochee, Northview and Alpharetta (for the East side of GA400).
As for the West side...any school that feeds into Milton High School (Northwestern and Hopewell Middle Schools...Summit Hill, Crabapple Crossing, Alpharetta Elementary Schools).
Please feel free to contact me regarding anything else in the area.