I don't know much about the hunger games trilogy but from what I have heard while the writing might be 5/6 grade the subject matter might not be. But I read Lord of the rings at about 11 and Watership Downs was fairly dystopian. I loved Shakespeare at 12/13 years. Then we all read the Virginia Andrews books at 14/15 and they were a bit icky. I have always wanted to read more of the classics but have had about a 30% completion rate so far.