My DD started school in New Zealand at the beginning of May (we have been here a couple of years and intend to stay).
The school system works differently to the UK one, as children normally start on their 5th birthday. They go into a Year 0/1 class when they start school, and then the next year they go into either a Year 1 or Year 2 class. The school year runs from January to December, and generally those who have a birthday before April 30th go into Year 2 and those born after go into 1, but the school has flexibility on this, and April/May birthdays have a lot of discussion. It is up to the teacher, with some parental discussion, as to where each child goes.
This does mean that some children going into Year 1 will have done 3 terms of school (there are 4 terms here), whereas others may have only done 1, and for Year 2 some 3/4 terms, others 6/7 terms. They generally stay in these years all the way through school, so some will go to uni at 17, others at 18 (if they go, obviously).
My DD's birthday is in the middle of April, at the end of term 1, so which year group she goes into is up to discussion. It will mean that she will either be the youngest in her year for her school career, or the oldest. Which do you think is better? Or does it make much of a difference? She is currently working at quite a bit above national standards for reading, above for writing and at the standard for maths, so her teacher says she will be academically able enough for Year 2, but the social side needs taking into account too.
Seems like a massive decision to be making, and we want to go with what the teacher feels is best for her as much as possible (they decide end of Nov), but I'd really love to get people's experiences on how much of a difference they think it makes!