There might be people that like to learn by looking at gigantic complex charts like that, but it´s definitely not my type of learning. I love organizing stuff, but I think they went a little bit overboard here.

It may be that the chart is above my level, but I do not see an organizational pattern to the chart that would aid my memory.  Does the way the chart is organized have more meaning to native speakers or more advanced speakers?  Or is it really as random as it appears to me?