For me, everything was riding on how I did on the MCAT. My grades were okay from a great school and my EC's were pretty decent, but I really needed to rock the MCAT. I spent 5 weeks hardcore studying and was averaging a 29 practice score near the end--very nearly considered canceling my scores/skipping the whole test and rescheduling. Then the month of waiting to see how it all went was incredibly agonizing; instead of using that time to write my PS, ended up basically panicking for a month. The day I got my score, I literally sat at home and watched cartoons all day in the vain hope that my heart would stop racing. When I pulled up my scores, I misread them at first and thought I had completely failed which of course really helped calm me down. But it all worked out for the best
Thank goodness that's over. Now off to the other fun parts of applying!!
PS--I'll bet if you asked this question again in April/May, people would shift to "waiting to hear from schools," me included!