570 is impossible for most schools. I don't think u still have time to retake GMAT for most schools.
I only know queen's deadline is ok for u to retake it,maybe there are some other schools' deadline also fit for u. hope u can get some strong recommendation letters for ur application
thank u for ur reply! I still have a question that if the deadline for a school is Feb.1, can i send the application materials after this date? I mean I should take the GMAT at the end of Jan, then fill out the online application form and pay for it before the deadline.