Hey Tam, although I am just starting off, but do have a feeling that 670 is a pretty decent score and if you have great essays, work ex, recos and stuff you should be through. However if you feel that you could have done much better and if you ahve some time to spare then there would be no harm in taking the exam all over again ( esp since you feel that you were scoring consistently in the 740 - 760 range of GP, which by consensus is fairly representative of the exam score)