Everything everyone else said is right on. Lots of memorization of reactions, for example. How does this alkene react with each of these 15 reagents. Real fun stuff, I found it easy, most people don't. The absolute most truthful thing I've ever heard about ochem is: Organic chemistry is
painfully cumulative. You have to keep up, work on it every day even if it is only a little.
Another thing that I had was drawing chemical structures from instrument readouts, stuff like H and C NMR, IR and Mass Spec. Synthesis is also a huge part of it, questions like sythesize this:
Starting with acetone as your only carbon source.
Best of luck to you.