I just wrote a bunch of the below and then came back up here to address something you said that's concerning me. You told me one of your weaknesses is "extreme panic." It's possible to try some last-minute fixes over the next 10 days (and I discuss those below), but if you're already having anxiety, then I really think you'd be better served by postponing your test date if at all possible. Possibly you have a deadline and that isn't an option - but if you have the flexibility, you might consider giving yourself a little more time, just to keep the anxiety down.
10 days left... the bad news is that our scores don't usually change that much in 10 days. The good news is that all tests have standard deviations, so for the GMAT, your target score is actually within one standard deviation of your practice test scores - just barely.
So, you have a shot, though I have to tell you what I tell all students: your realistic goal should be to aim for the score that you're scoring on practice tests a week to two weeks before the real test - in your case, 700. (This assumes that you took the practice tests under 100% official conditions,
including essays. If you deviated from official test conditions, you might have an inflated score as a result. A lot of people skip the essays in practice, for example, and then have a drop on the verbal section on test day because they weren't fully prepared for the necessary stamina.)
If you have a couple of major problems to tackle, you can try some quick fixes in 10 days, though this isn't ideal. Ideally, you'd give yourself adequate time (several weeks) to fix major problems. If you're working against a deadline, you just have to do what you have to do. If you don't have a specific deadline, or if you have some flexibility, you might consider postponing for a few weeks. [Note: this is when I stopped and added that paragraph above.]
Okay, so you mention timing as a problem. Is it a problem on both quant and verbal? Or just one?
For quant, have you already tried learning about how long one minute is without looking at a watch or stopwatch? This usually takes a good 3 or more weeks to work fully, but you may be able to make at least some progress in 10 days.
If you don't have one already, buy yourself a stopwatch with lap timing capability. When you go to do a set of problems, start the stopwatch but turn it over so you can't see the time. Every time you think one minute has gone by, push the lap button. When you're done, see how good you were - and whether you tend to over or underestimate. Get yourself to the point where you're within 15 seconds either way on a regular basis (that is, you can generally predict between 45 sec and 1min 15 sec). Note: at the same time that you are using the stopwatch to time this "1-minute" thing, also use the OG Stopwatch (in your student center) to track the total time spent on each question.
On verbal, try this way of working through the answers:
1st pass through answers: place answers into 1 of 2 categories, definitely wrong or maybe. DO NOT decide whether something is right (until you have looked at each choice at least once).
2nd pass through: look only at the "maybe" answers, look more closely, choose one
When you are down to two answers on verbal, look at each answer ONCE more, then pick one and move on.
Again, the above is something that typically takes more than 10 days to
master, but that doesn't mean you can't make some progress with it in 10 days.
For the topic-related stuff, don't even worry about that (unless you do decide to delay your test). Know your strengths and weaknesses, and respond accordingly. Take a look at these couple of articles:
http://www.beatthegmat.com/mba/2010/08/ ... -game-planhttp://www.beatthegmat.com/mba/2010/08/ ... -to-reviewFinally, please pleae do not burn yourself out over the next ten days. If you go into the test mentally fatigued, that will just make the anxiety even worse. As discussed in the above articles, the closer you get to test day, the less you do. You aren't going to change much about your performance in the last few days - at that point, you just accept where you're at and do some review.
Good luck - let us know how it goes.