If you haven't taken any psych/soc courses, I'd get your hands on as many prep books for that section as you can. Depending on what school you'd take psych/soc at, you would spend $200/credit on the low end to $700/credit on the high end? ... just spend that money gathering up multiple prep books instead of taking the courses. I think if you use TPR, Kaplan, EK, and Khan for Psych/Soc you'd be fine.
I'm a psych major, and when I took the MCAT in the summer I was surprised to see so many "advanced" psych topics that wouldn't have been touched on in psych 101. So I'd honestly think it's a waste of time in comparison to take psych 101, than to spend the time reading multiple prep books. Psych isn't anything hard to learn, and if you scored a 32 before you're surely intelligent enough to learn it on your own.