I can't agree more with what has already been said.
Initially, I was a bio major, but after taking ochem and seeing the logic and patterns that it is laced with, I switched to chemistry and have not regretted it since.
To succeed in ochem (or any chem course for that matter), it is to read the text book (at such a speed that you comprehend the material!), then do practice problems. Over and over. I spent probably 15+ hours per exam for ochem I and received a high A in the course. By the time ochem II rolled around, I was so familiar with the mechanism patterns and the motif of stability that I could read the assigned chapters the night before and ace the exam the next day.
It really is an intuitively sound course, but you have to put the time in! I also work in an ochem research lab, so knowing what the reactions mean beyond the chemical equation is also helpful for info retention.
Additionally, I would suggest getting an MCAT prep book on ochem. I find that the prep books (specifically BR and EK) explain topics in the most efficient ways I have ever seen.
Good luck!