680 but weird Q&V scores

[ugadulu]

Hi, I took the test yesterday and got 680, but my performance was uneven. Did really good on the verbal and really bad on the math part, during which I had an incident with the people in the control room. They did not see me waving for more papaer. I had to abandon my seat and walk towards them in order for them to see me. UNBELIVABLE!! So be ware. While taking the math section I did not feel it was particularly hard, I dont remeber any awful questions, but I ran out of time and had to guess the last 3. Either those last questions threw me down to the 66th percentile or I screwd the whole section and didn´t even notice it.
As for preparation I advice the regular; Kaplan, 800.com, and Official Guide. Stay away from GMAT SECRETS from Mo Media, they are a complete fraud.
My numbers for the powerprep exams before working with the Official Guide were
720 and 690, with Q(48) and Q(49)n respectively.
Finally, I am appliyng to a masters in finance in London, does any one think I shoul not retake the test? Thank you.