Try the CELM classifier

CELM is the system behind this site's book metadata. Type a children's book title, choose a market, and it sorts the title into one of five categories: Grade-Specific, Topic-Specific, Emotive, Brand-Specific or General.

In testing, CELM got about 76 in 100 titles right on unseen titles. Treat the result as a suggestion, not a final label.