ya1012, he looks like he's enjoying but there were plenty of tears also la
what you have to do is talk to the teachers about what the routine is like for the pre nursery todds, like what time eat, what time sleep etc.
then you try and get this routine happening at home before school starts. like my boy used to sleep like midnight - 1am this kind of timing and he'll wake at like 10-11am in the morning! so i had to put a stop to this and started putting him to sleep earlier to get him ready for when school starts. so that's how it was for me, nothing major la. also if you are controlling what he eats, then it's useful to get the menu from the school. for my son, he's partial vegetarian (only meat he takes is fish), so on days when they serve chicken, i will cook for him his lunch and ask the teachers to feed him that instead of the school's food...
that's about it, hope it helps