I was wondering where your gifted child was / is in kindergarten and what sort of modifications are being made if any. Would you mind being specific and telling me what type of materials he or she could read if he or she were reading, what sort of math things he or she could do, etc. to try to project where we might be in two years.
Of course, as I'm sure you know it's impossible to tell for sure, but fwiw:
DS started kindergarten (P1 here) at 4y10m reading some chapter books, e.g. I remember him enjoying the Worst Witch series and Winnie the Pooh before he started school, but mostly preferring shorter stories (he was Thomas the Tank Engine mad, for example, and we had the complete collection). During the course of the year he advanced to being able to read anything he wants to. That is, decoding simply ceased to be an issue, although he was very easily scared by fiction. Things he particularly enjoyed during the year included the Horrid Henry series (which I'm happy to say he grew out of fast :-) Cressida Cowell Dragonese books, everything by Roald Dahl, and various adult science and nature stuff. His teacher, who was great, took the view that there was obviously no need to teach him to read and that what mattered was that he read a wide variety of interesting things, and sent him home with lots of different things, fiction and non-fiction.
His writing was entirely age-appropriate: he started the year able to write his name but not much more, made great strides during the year, but not more than his age peers did, and he remains pretty average for this and other fine-motor-skills tasks, I think. Because of this, most of what happened in the classroom was appropriate for him and he did it with the others. (For the same reason, early entrance would not have been good in his case.)
In maths, he started school not very far ahead - he was doing simple (two digit) addition and subtraction, but he wasn't especially interested and we certainly didn't push it - but then he had a surge of interest shortly after he started. At the end of that school year, at 5y8m, he was doing 4th grade maths in ALEKS (and I should say that it was in no way challenging, i.e. his grade level was limited by how much stuff he'd had time to learn since he started being interested, not by his cognitive level). At school he did a variety of workbooks from higher years and other stuff provided by his teacher (and now, we have a close cooperation and he e.g. does ALEKS worksheets at school).
Try not to worry too much! In a way, it's easier with a DC who is miles ahead when they start school than with one who is super bright but only a little ahead in achievement, because at least you don't have trouble convincing the school *that* your child needs something different.
