This had some great characters-- I was a big fan of younger sister Henley, who was struggling with speech difficulties. This is something I haven't seen in middle grade literature much. The parents were very supportive, even though the father was out of town most of the week for work, and that was nice to see. Sanam, Red, and Dylan are all good characters, especially since they are generally understanding, but occasionally still get irritated with Clea. The most interesting part to me were the details about testing, medication, and coping strategies. Like this author's Braced, these are woven into the story in a way that doesn't slow it down.
Readers who are interested in chess will appreciate the details of the tournaments in which Clea plays.
It would be nice to see more books featuring characters with different challenges that don't portray the challenges as the worst thing in the world. Middle grade readers may have all sorts of problems, but they are generally upbeat, and seeing book characters deal with their problems in a realistic but positive way is great for all readers, whether they face a similar struggle themselves or not.