I have some few suggestions from the most urgent to the less urgent:
- A simple way to delete the Notebooks and Jumbles(directly on their side).
-An upgrade to the calendar to allow the user to edit/add things in it.
-moar possibilities of integrations(an APi should suffice)
-Synchronization(with some priority on one device, maybe?).
-An automated software time-tracking, allowing the user to see if they have spent their day making games on Unity or playing on Minecraft. Useful for seeing their efficiency.