Read my post about preparing for the MCAT.
Picmonic is what I use in med school. Based on my experience with them, I'd bet they're an awesome resource for MCAT materials. However, since Picmonic unfortunately didn't exist when I took the MCAT, I can't personally verify this. :)
I find HarpinMartin's "Handwritten Tutorials" on YouTube extremely helpful. Here are some of his videos that cover MCAT material. (Use these to refresh your memory, you don't need to memorize every detail!) View his channel here.
I'll add more resources as I discover them.
Please email me any questions or suggestions!