As far as public schools go, if you want to move to Copiah county- their is the Copiah county school district and the Hazlehurst city district. The only school I would recommend is Wesson Attendance Center- I believe its K-12 and was rated a Level 4 (out of 5) in 2007.
The Copiah county system also has Crystal Springs, but I would stay away from that and the Hazlehurst city system has been taken over by the state I believe, so I would avoid that also. The schools in Byram or Terry are in the Hinds county school district and they would be good if you are in either of those towns. But Terry is further South than Byram so you would be closer to Gallman.
Another option would be to look south to Brookhaven or Lincoln county area. Their is the Brookhaven city school district which is OK, and the Lincoln county school district which has 4 smaller schools that are all K-12, and are pretty good schools.
http://orsap.mde.k12.ms.us:8080/MAAR...70&TestPanel=1