Schulte tables Fixing the attention on a certain point and increasing the level of concentration does not have to be a difficult task. The mind can do it, so it can be trained. But, how? by stimulating vision, attention, and memory through the Schulte Table app. What is a Schulte table? It is usually a 5x5 cell table, in which numbers from 1 to 25 or letters (from A to Z) are usually placed randomly. Although depending on the level of difficulty it could also increase to 6x6 or more squares. T