Now I rarely ever disagree with grinity ;-) but at 6 years old I would do all I could to finish the year at your current school. Kids tend to group up - unless it is a really small school - at the beginning of the year all the kids will have that lost you are you, what's that teacher like, feeling not just yours. Pools and playground over the summer can help make friends... but kids are more resilient than us so either why he'll adjust well!