Interesting that is 3rd grade at 9-10. 10 year olds in the US are typically in 5th grade. What ages do earlier grades align to?
Generally in the US it is:
* K ~5 yo
* 1st ~6 yo
* 2nd ~7 yo
* 3rd ~8 yo
* 4th ~9 yo
* 5th ~10 yos
Give or take of course since birthdays don't align perfectly.
That seems to roughly align to US standards for the same age but not the same grade.