This is a tricky question. Assuming you can afford to retake the test and the dates are available, there are a couple of other criteria that you should keep in mind when making this decision:

(a) Do you have enough time?
If the first time you took your GRE was already kind of cutting it close (late October or so), you will have little time to do any more substantial preparation.

(b) Will it help?
If the reason your first test did not go so well was because of poor time management or factors other than lack of preparation, retaking the test might make more sense. However, you should take steps to ensure that the same factors do not appear the second time you take the test. So, if the cause was, say, lack of time management then you should do more practice with actual timed tests to make sure that you figure out how to best manage those precious minutes. If it was silly mathematical mistakes, practicing will help there as well.