Hi ShapleyMan,
First off, a 660/Q45 is a solid Score, so it could be enough to get you into your first-choice School. As such, a retest might not be necessary. Depending on the Schools that you plan to apply to, you would likely find it beneficial to speak with an Admissions Expert about your overall profile and plans. Those Experts should be able to answer your Admissions questions and help define the specific areas of your profile that could use some improvement. There's a Forum full of those Experts here:
https://gmatclub.com/forum/ask-admissio ... tants-124/It's worth noting that many GMATers spend 3 months (or more) of consistent study time before they hit their 'peak' scores, so if you studied for just 1 month, then you might naturally improve simply by putting in the additional time and effort.
1) What was your overall Goal Score when you began your studies?
2) What Schools are you planning to apply to and when are you planning to apply?
If you took your Official GMAT at a Test Center, then you might also choose to purchase the Enhanced Score Report. While the ESR doesn’t provide a lot of information, there are usually a few data points that we can use to define what went wrong on Test Day (and what you should work on to score higher). If you purchase the ESR, then I'll be happy to analyze it for you.
GMAT assassins aren't born, they're made,
Rich
Contact Rich at: Rich.C@empowergmat.com