I would have to ask though, if you didn't have your MVP would you have known to add the functionality that the teachers requested?
Its possible you would have spent months building things only to discover later you built the wrong things.
Its possible you would have spent months building things only to discover later you built the wrong things.
* talk to potential customers
* do it!
* PROFIT
Whereas unless you are an expert yourself in the domain you're entering, it's almost hopeless.
People/businesses don't know what they want, until it's presented to them on a golden platter and all of their colleagues/competitors are already braying about it.