Let's be realistic - 700 is a stretch.
680 is pushing it as well, but it is possible with a bit of luck on test day. Clearly you know how to target your weaknesses and improve upon them. (A 380 to a 620 is OUTSTANDING.)
The most important thing at this point is to focus 90% of your effort on the question types causing you to miss 300 to 700 level questions. (With just a few weeks to prepare, you are most likely not going to be able to internalize the strategy needed to quickly tackle 700+
questions in your weakest areas because you will need that time to internalize the strategy to tackle 300-700
level questions in your weakest areas.)
With some diligent work on CR, you can probably raise your Verbal to around a 38 or a 39 on test day. With targeted work on quantitative, a 43 or a 44 is not out of the question. A 44Q/38V would put you right around a 670/680.
So here's the point. Use the same study skills that have gotten you to a 620. You know how you learn and you know your weaknesses. Forget about 700+ questions at this point unless it is something with which you already feel comfortable. Trust me on this. Get your 500-700 level question strategy down COLD
, take the test, and go from there.
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Each moment of time ought to be put to proper use, either in business, in improving the mind, in the innocent and necessary relaxations and entertainments of life, or in the care of the moral and religious part of our nature.
-William Andrus Alcott