No, I do not read them. The only reason I’d read a book ahead of time would be if it was a complete unknown to me and I wasn’t sure f the content/viewpoint of the author. For example; I’m reading Oscar Wilde’s Fairy TAles, because I know of the controversial life of the author.
When they narrate, I do one of two things:
If the book has a teacher’s guide, I can use that; following along with the questions lets me know if they understand the literal and intertpretive comprehension required, plus if they are following in consecutive order.
The other is I follow along with them. I read and scan quickly, so as they narrate, I read along with them. I hope that makes sense. It works fine for me that way. If I catch two or three sentences that they miss, I may redirect during the narration with a couple of words or ask them about it at the end.
HTH, Rachel