I could recite every physics formula in the book right now, and very few of them were actually needed on the MCAT. Definitely focus on WHAT the formulas mean-- ie, if you increase the length of a soundwave, what happens to the frequency, if anything? If a skier weighs more, does he acquire more speed at the bottom of a slope, less or the same? If you add a lightbulb to a ciruit, does the current increase, decrease, remain the same and why? Etc. Examcrackers sort of focuses on these concepts in a more general sense than Kaplan does.