is there any way you can do part time?
I think most schools want to see some improvement.Try as much as you can to do good in your classes since they are required and you have to put the grades into the supplementary application. And they will see that added improvement.
And try as hard as you can to increase your OAT. Like I said I think it is best if you put off the test until you can really study for it, if not then you are just wasting time and money. I submitted everything by decemeber, and even retook my oat in december. And still got invites.
Just work on re -wording your application, essay, explain any low grades and what you learned. Remember you don't have to wait to take the OAT to start on your application and you do get the scores the same day. So if you want to get everything in by sept, oct or even nov, which i still consider early then take the test during that month.