each section is basically a reading + some grammar points, with some reading comprehension questions as well. the readings themes are pretty interesting. even having completed Quartet II, though, there were a lot of words I didn't know, so reading was kind of a slog. at the same time, I also learned a lot. it definitely feels appropriate after Quartet II. the "useful expressions" section has questions on various grammar and vocabulary topics, some (most?) of which aren't really mentioned in the