I like the concept, but density of the text and awkward UX are keeping me from engaging deeper.

There should be one (and only one) obvious button to advance the flow at all times. For instance:

* I took the “test” before realizing the topics were clickable.

* after getting a test question right at the end of a section, my “reward” was another wall of text explaining the question I’d just gotten right. Confusing and off-putting.