This probably isn't the answer you're going to want to hear, but it's the best answer I have for you: if you really want a 730, you almost certainly need to postpone your exam. I don't think I've ever met someone who went from 580 to 730 in 3 weeks.
For example, timing issues alone typically take about 4 to 6 weeks to fix - and if this was only your first time working in an adaptive format under timed conditions, you'll likely need 6+ weeks to get the timing down.
If you don't want to postpone, then my next suggestion is to lower your goal score. If you try to hit 730 in 3 weeks, you're really likely to make a bunch of bad decisions about how to get there (because of the pressure of trying to make such a huge leap) and then you're more likely to crash on test day.
How have you studied so far? What materials have you been using?
You mention your overall score but don't tell me your Q and V subscores. You do mention the number incorrect... but that actually tells me that you have even further to go, because the GMAT isn't scored based upon # correct. :) You need to learn the basics about how the scoring works in order to know how to make good decisions about timing.
Start with this:
https://www.manhattangmat.com/blog/inde ... lly-tests/If you want more detail about the scoring, read the Scoring section of our free e-book The GMAT Uncovered. (It's already in your student account with us - even if it's a free account!)
Next, read this (and follow the links within it to the other articles):
http://www.manhattangmat.com/blog/index ... -the-gmat/Have you been studying in this way so far? That's what it'll take to get to 730.
Next, use the below to analyze your most recent MGMAT CAT(s):
http://www.manhattangmat.com/blog/index ... ice-tests/And look through this:
http://www.manhattangmat.com/blog/index ... an-part-1/Figure out what you think you should do based on all of that analysis and start doing it. Also, come back here and tell us what you think; we'll tell you whether we agree and advise you further. (Note: do share an analysis with us, not just the raw data. Part of getting better is developing your ability to analyze your results - figure out what they mean and what you think you should do about them!)