Originally Posted by MedPR
But how do you know which one is the hardest? If you start to read one and it seems hard, you'll just move on to the next one, but then if that one seems harder do you go back to the one before?
It's not necessarily a matter of looking for the hardest passage but, some people hate philosophy passages (or politics etc.) so, in an effort to save time they'd leave that one until the end where they may have a chance to spend more time on it.
Personally, I wouldn't do this but, with little time left before one's MCAT date without time for improvement it can be a useful strategy.