For whom are harry potter and college textbooks appropriate for at the different reading levels?

Doing a fry readability test and am now trying to figure out for whom each book would be appropriate for at each reading level (Independent, Instructional, and frustrational)



For whom would the harry potter books be appropriate for at the independent, instructional, and frustrational level and for who would college textbooks be appropriate for at the same reading levels?For whom are harry potter and college textbooks appropriate for at the different reading levels?
Harry Potter Books increase in difficulty as Harry matures. The first one is meant for 10-11 year olds, but it really depends on the level of the individual student. COllege textbooks vary in difficulty according to the subject matter, so it's impossible to say..