Hiya-- I think that if you feel you could improve, you can always try via GMAC etc to re-take once more asap, and if you DO improve, then try and update the schools if they are still deciding... but all that said, there are no guarantees they'll consider updates if after-the-fact, it's just worth a shot if the timing works out just in case... so all a matter of how badly you want to try knowing that it may or may not help, and how much you think you could improve. I wouldn't say it's urgent unless again you feel you really could improve, if talking about R2 apps, many of which are already in decision-mode now.... not sure if you've had interview invites already... good luck!