Technology at the service of teachers aiming to accelerate the learning process of students. We have devised a tool that stores the individual progress of each student to teach based on what students have left to learn, obtaining this information in real time in each class. We manage to go 5 times faster than any other system that uses traditional books or photocopies. We have developed the world's first "living textbook" that is constantly being updated, thanks to the use of teachers, to find the best way to teach.