You may have to stay with him during the lessons. I know our daughter was okay, but the boys who were similar age weren’t allowed to be left on their own in this particular ski school.
They will love it, but they do tend to get tired towards the end of the week.
I took ours swimming each afternoon as they were getting too knackered being on ski’s for the whole idea.
Our boys after they learnt the snow plough, realised that that slowed them down and decided straight down was much more fun.
If it’s just one child and you can ski, I’m sure you can shepherd him down. I sometimes see some people with a strap around the kids waist and the parent behind, so they let the kid go in front, but have control if they need to stop or something.
Enjoy.