How about magazine subscriptions?
Or his own personal star to go with the telescope (if he's likes that sort of cache thing) ?
Depending on how hard he is on his supplies, maybe a new backpack or school supplies.
The Bible is a testimony -- a way people have passed along their story through the generations.
Think of a family scrap book -- it's not exactly a historical nor scientific text. Yet, it does tell the history and biology of the family, it is truthful and carries a deep, personal meaning for...
Well, I would say most class clowns do so because of academic problems, but if you say he's book smart I guess not.
How about social smarts? Does he actually know how to be a student? (Kids who've never been in day-care or didn't have older siblings to play school with sometimes don't really...
The Indian in the cupboard
The Littles
The Light in the Attic (poetry, wonderful and fun!)
The Magic Tree House (series)
Charlot's Web
You can also simply take them to the library and have them pick out their own.