When a kid starts school in Sepember (i.e. 9 yrs old, 4th grade) in the US but moves before the start of the NZ schoolyear to begin a "new school year" in February, do they start in the same (ie begin again in the equivalent of 4th grade which is called something else in NZ) or next grade (ie begin in the equivalent of 5th grade since they just finished 1/2 of the 4th grade year)?
(This may be a question for the Americans on the list (???) - I'm not sure how the UK system works - maybe you begin new school year's in September, too)