How is "Up next" chosen for a student?

"Up next" is the first item without a status, in curriculum order: first items without a category, then each category, each by the position of its items.

• An item that is Learned or Validated has a status; an item learned out of order does not move "Up next" (it stays the first item left without a status).
• A trashed item is never "Up next"; its statuses return when it is restored.
• Last learned is something else: the item with the most recent learning date.
• When everything has a status: "The whole curriculum is learned".
• To change what comes next, the owner changes the curriculum's order (Move up / Move down or drag ≡); an instructor cannot. Removing a status (tap the active button) puts the item back to "no status".