Hi Brightlight96,
First off, a 670 is a strong Score, so depending on your Quant Scaled Score and your overall profile, it could be enough to get you into your first-choice School. As such, a retest might not be necessary. You're ultimately asking Admissions questions though, so 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/Before I can offer you the specific advice that you’re looking for regarding your studies, it would help if you could provide a bit more information on how you've been studying and your goals:
Studies:
1) When did you take your first Official GMAT and what were your Quant and Verbal Scaled Scores for that attempt?
2) How long have you studied in total? How many hours do you typically study each week?
3) What study materials have you used so far?
4) On what dates did you take EACH of your CATs/mocks and how did you score on EACH (including the Quant and Verbal Scaled Scores for EACH)?
Goals:
5) When is your next official Test Date? For your next attempt, are you planning to take the At-home GMAT or are you planning to take your GMAT at a Test Facility?
6) What Schools are you planning to apply to? If you are planning to apply soon, then what specific application deadlines are you facing?
If you took your first 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