Retired teacher here...glad to see fresh thinking on this problem. The mega-publishers that serve school districts are stuck in a 1980s model. A project related

Retired teacher here...glad to see fresh thinking on this problem. The mega-publishers that serve school districts are stuck in a 1980s model. A project related to yours is ASSiSTments at Worcester Polytechnic Institute. The market is big, with space for several innovative projects.