How does/can, a very young school starter, behind peers, catch up during primary? For example, they start reception and aren't interested in and unable to recognise or write letters/numbers/ sounds, can snip but not cut out shapes, not drawing or interested in scribbling, can colour in a little if asked, can't name colours, can't count to ten. They will miss some class time due to napping. They've had a high quality preschool.
What happens and how do they cope in year one, and onwards?