Hola, did you already apply for OMSAS this year? If you have, the 9 won't kill you. U of T takes 9s. But queen's and western are more stringent. And I know that Dalhousie will take a composite of 30+ and will excuse a 9 in a section. p.s. Dalhousie's application isn't due until Nov 2nd.
But, if you haven't applied yet, then a re-write doesn't sound too bad. You can bring your VR up, and also ace the other sciences.
Good luck. It all works out in the end
Just gotta have faith in God and do the best that you can do, and make a positive difference any way you can while you're at it.
Best,
AG