App

I think an interesting and useful app for learning and teaching in the school could be a kind of e-book but more interactive. 
In the present e-books you can only read but in the e-books I want for the future you could watch videos, images, documentaries and many things. Also if you're studying the book will suggest you what you need to study more or what is more difficult for you. It would say you some extra work or activities to do, too. Maybe we will have to wait some years because the technology isn't so advanced now, but I think that's the future of education.