Nice project. It is great seeing learning platforms using interactive 3D instead of the usual static quiz interfaces. Using Three.js for a question based journey makes the experience more engaging for kids, especially when categories, difficulty levels, and progression are visualized in a game like environment.
Educational tools benefit a lot from this kind of approach because the interaction itself becomes part of the learning process rather than just answering questions on a flat page.
I have also been exploring similar ideas where learning and exploration happen inside interactive 3D environments. Instead of simple menus, the knowledge or activity becomes part of a small world the user can navigate.
Here is a small viewer demo from one of my experiments:
My goal is more toward open world style environments and interactive experiences, but projects like this show how effective Three.js can be for education and learning platforms.
Nice work and thanks for sharing it with the community.