Chapter 8 was more positional in nature and concerns the centralization of pieces. I did well enough to pass.
In one problem, Ex. 8-8 I went e4, which gets no points. I was rather mystified by this since I thought it was pretty good. I ended up putting it on two different engines (Stockfish 9 and Komodo 12.1.1). Both ranked e4 highly, and at times depending on the ply deep, had it ranked first. Furthermore, it ranked higher than the solution that got 3 points. Moves given for 2 points by Yusupov actually prepare e4! I hadn't thought it needed preparation, and the engines show I'm correct.
I finished up chapter 7 today on discovered attacks. I found the diagrams rather easier than normal. With the graded exercises I ended up with 12 of 15, which is a rating of good.
Now that I have been doing these for a while, I think I can state with some certainty that Yusupov is appropriate for a player of my level.
What that level actually is, would be hard to say.