I read The Great Gatsby when I was in 9th grade and I remember enjoying it. It's known as "a portrait of the Jazz Age" and it captured my young imagination and gave me a lifelong interest in historical fiction and the Jazz Age.
I have plans to read it again, as an adult. It will be interesting to see if I still feel the same way. I do know that even if I don't, what it did for me as a teenager will stay with me. I will never loose my thirst for historical fiction!