My kid is nearly 4 but always wee wee in the classroom. He could go toilet by himself but only too shy to tell the teacher when he wants wee wee. Any advise on how to help him?
Tricky. I think you need to ask the teacher to help out.
I'm guessing if the teacher comes out and asks he might even say "no". It's a matter of trust. Maybe a classmate can go with him to the bathroom. I'm out of ideas.
My daughter is nearly 4 and I kow that they always take all the kids to the toilet in certain hours( I guess they know - when they drink and stuff). when kids play or do other stuff they tend to "push" the need to go to toilet because they don't want to lose out.
If he doesn't have similar issue at home, I would go with axptguy, and talk to teacher to help out, he/se ought to know how to deal with it.