I focused on the subjects that I was weak on. Ignored O-Chem entirely since I'm an O-chem tutor and I took physiology and biochem the semester prior to my MCAT exam so it was fresh in my mind.
Honestly though, you don't need to study all that hard for MCAT if you're solely applying for DPM. I generally studied in the evenings after work (10-12 hours a week for 6 weeks) with the mindset that I only need to get a low to mid 20s to be accepted to most podiatry schools. I didn't take any of the AAMC practice tests so I wasn't too sure how I stand prior to taking the MCAT. However, I was a little surprised that I managed to break 30 points. In my honest opinion after taking the MCAT, if you have a solid foundation of the basic sciences, then you don't need to go all out on the MCAT study.
Good luck