You may also want to check out your county's student performance standards to make sure that you are keeping up with whatever grade level he should be achieving. I looked up our county's 3rd-5th grade levels Language Arts (for you) and they all list writing skills in "Narrative Writing," "Informational Writing" and "Persuasive Writing," with examples of books they used. Here is our county's website. Maybe you can find something like it for yours.

http://www.cherokee.k12.ga.us/ps/default.aspx

This was also helpful for me just now. I didn't realize that they broke it down like this so specifically with titles as well.:)

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Mom to DS6