Children learn at different speeds, the same way some babies walk early and some walk late. Learning comes in spurts and plateaus, so it is worth taking the long view.
You can make a big difference at home. Keep it low-stress, because what we want most is for children to love learning. These Ministry of Education guides have ideas for reading, writing and maths at each stage.
By year level
After one year at school PDF ↓
After two years at school PDF ↓
After three years at school PDF ↓
End of Year 4 PDF ↓
End of Year 5 PDF ↓
End of Year 6 PDF ↓
Every year level, in your language