The concept map
Name a concept and see exactly what it rests on, how far back the chain reaches, and what later days will need it. Every link is a prerequisite declared in the curriculum.
Runs in your browser. Built from the real curriculum.
Every edge here is a real prerequisite declared in the curriculum, not a drawing. That is also why the picture is readable: the horizontal position is the day a concept is introduced, so every line runs left to right, and a line that ever pointed backwards would be a bug the build refuses to ship.
The useful thing to do with it is to pick something you find hard and look left. Almost every concept that will not stick is resting on one earlier thing that never landed properly, and it is usually visible two or three hops back rather than in the thing you were studying.
Looking right is the other half. It tells you what a weak concept is about to cost you, which is the honest argument for going back rather than pressing on.