Wait ... is the reason you are waiting until August because you haven't yet finished with OChem and you're worried you won't know enough? Because I think that's a mistake. I took the MCAT without finishing physics (optics, light, etc.) and I was fine. Most people are not completely done with their premed classes before taking the MCAT. You just have to sort of find a book and learn the stuff you don't know on your own. If there is anyway you can take the April MCAT instead of the August MCAT, because you're really at a disadvantage if you apply so late. We are talking about next year, right? I'm not just ranting about something that can't be fixed now, am I?