I found this little article where they recommended 10 apps with what I think is a good description, because it's short enough.
https://virtualrealityforeducation.c...ard-resources/
Also some info from another one from a website some recommendations
https://www.maxboxvr.com/blogs/blog/...-apps-for-kids
But What I think is find some app you think is educational and be the teacher with that, because VR for children is so far a supervised activity, so because you or some adult have to be with them, the best app is the app you can get more of it but also the one that allows you to bring more to the children, for that I think the app you know the best is the right one.