How do you know it is high school level?

Check themes in the books and how they are presented.  There is just some material that is meant for an older audience.  Sometimes it’s the way a bit of information is written that makes it for older students. In reality, though, what may be appropriate for my child may not be for yours. I have a 12 yo dd who just can not handle some age appropriate material because of sensitivities.  She is a feeler and extremely sensitive to some situations when the come up in books or in real life for that matter. Sometimes I can substitute another very good book that is age appropriate.  Sometimes I add in books that may be considered for a younger crowd, but still present good information.  In my estimation, that is appropriate for her.

Also, at the CMI conference, there were a few seminars in which the speaker made a point of talking about using picture books or good lit written for young ones with older students.  Don’t be afraid to use a very good book written toward a younger audience with your older child.  Don’t make it a steady diet unless that is appropriate for your older student’s needs or perhaps you are doing a survey of children’s literature as part of an English credit in high school, and that would only be for that class.

Is that helpful?