honestly, from my point of view...the first test had a very little time, but this can't hold you back...others had the same test!
Based upon my experience...keep learning & reading in your normal days...preparation for such tests will not help that much...its the continuous reading & exploring that would help you...in addition to previous testing of this kind (Familiarazation).
General Knowledge can't increase within 2 weeks...its the amount of info & experiences that you would have accumulated throughout the last couple of months/years
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Even if you are able to pass, your scores are going to be compared with the SA & AUS guys...so chances will decrease...overall It was a great experience! and would go for it whenever its possible.