I didn't read this classic in high school, but I tackled it in college, and I'm so glad I did.
1984 (or Nineteen Eighty-Four) by George Orwell is a futuristic dystopian. It's a difficult little book. It presents many concepts that are hard to understand and wrap your head around because it features a lot of contradictory ideas and phrases.
I didn't enjoy it at first, but I kept pushing through. Sometimes classics aren't very enjoyable until the end. And about two-thirds of the way through this one, I finally liked it. And I liked it a lot.
It's been a few years, and I'd sort of like to re-read it. It's difficult to decide to reread classics though because they typically are more difficult and time-consuming to read.
I would recommend this to people who enjoy dystopians and don't mind slow building books that are a little difficult to follow.