ha! I'd wager that overlap between red/green can be much smaller than what your picture shows, depending on one's major.
I'm going through the AAMC official guide this week and while not many of the topics listed are unfamiliar to me, most of what I do recall from biology, organic chem, physics, etc.. is not even on their outline. SMH
So does one have to be a bio major to really be ready for the MCAT on a normal timeframe?