Try your luck with the LSAT?
Seriously though, it depends on why you think you didn't do so well on the MCAT. I found the test to rely on basic principles and understanding of phenomena - so I'd say the best preparation is to have thoroughly mastered those undergraduate science courses while you were taking them. At least, that's what I felt most of the questions were based on - didn't need to know anything like the viscosity equation (the formulas for gravitational, electrical, and magnetic forces were even given in one passage I had).
However, I do hope that the questions based on memorization that I missed won't cause a low score.. would be kinda bad if they did
Just some things like nomenclature of complex ions and the stereochemistry of Br2 addition that are hard to catch unless you go right back and try to learn everything in your textbook. I admit it probably did help to have taken physiology this year. But, if you look at it the other way, if I'd taken the MCAT last year and taught myself all that physiology beforehand, I'd have done better in the course
Well if bad scores are due to inadequate comprehension, I would probably work steadily and practice questions regularly. If straight memorization.. I guess the reinforcement couldn't hurt, but it might interfere with coursework in my case at least, as some of my courses are pretty memorization intense, and I don't retain stuff that well to begin with
Things like F=ma I would find pretty hard to forget anyhow, having been drilled through countless problems in high school/univ...
Low scores could also be due to verbal or writing, in which I'd definitely work regularly.. just think, you can do all of the prompts ahead of time and memorize them
Verbal can certainly be practiced by reading difficult material, and as a plus it'll keep you up to date with current events for the interview. Scores are also affected by illness, lack of sleep, testing conditions, test taking skills etc. so it really depends.