Should I retake my GMAT?

Hi there,

I have to admit I'm a bit frustrated... I just took my GMAT today and got a relatively low score compared to what I expected. I would like your opinion as to whether I should retake my GMAT or not.

The first time I took my GMAT was about a year ago; I got a 670.
Here are a few of my scores leading up to the test:

Kaplan:
730
730

MGMAT:
660
680

Knewton:
730
670

GMATPrep:
760
740

I got the 740 on Saturday, 2 days before my exam (probably a bad idea?), and ended up getting a 710
...

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