When I was high school student, I wrote a book log. Most of books I've read were fiction. I think it's not good habit of reading. No one told me how to pick books. Just said "The more read, more great person.".
There is a rule for choose books in my mentor teacher class. The students should choose two kinds of books.
1. Fiction or whatever they want
It will help students to pick books and to build reading habits.
On September, I'll adapt this way to my students.