Hi akiara,
To start, a 670/Q46 is a solid Score, so it could be enough to get you into your first-choice School. You have the potential to pick up some meaningful points in BOTH the Quant and Verbal sections though, so continuing to study makes a certain amount of sense.
The OG books are great sources for practice questions, but they're not designed to teach you Tactics, patterns or the little 'secrets' behind the GMAT - for those, you'll need Course-oriented materials. If your goal is to score significantly higher (you referenced a 720 in one of your other posts), then you will have to train to "see" (and respond to) the GMAT in new ways. Working through lots of additional practice questions in the same general ways that you did before will likely lead to a similar score result (in the high-600s).
Before I can offer you the specific advice that you’re looking for, 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 the Official GMAT?
2) How long have you studied? How many hours do you typically study each week?
3) What study materials have you used so far? What "brands" of CATs/mocks have you taken?
4) On what dates (or approximate 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) What is your overall goal score?
6) When are you planning to apply to Business School and what Schools are you planning to apply to?
If you took the 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