Let's see - it looks like you've got about a week to go...
There's not a ton you can do, unfortunately, in just a week. As a general rule, what you're scoring now is about what you should expect to score on the real thing in a week - so high 500s.
Question for you - if you don't get the 600 this year, what will you do? Postpone and apply next year? Apply somewhere else this year that will take a lower score?
You're close enough to the 600 mark (assuming that you took that 570 exam under 100% official conditions) that you do have a shot - so if you would just wait and apply to the same program next year, then go for it this year. If, on the other hand, you'd apply someplace else and that other place has a later deadline, then you've got a tougher decision to make. Do you go for it in a week or do you give yourself another few weeks to have a greater chance of crossing 600 (but missing the deadline for the first school)?
I'll answer assuming that you're going to go for it but, if you decide to postpone, let me know.
Did you time yourself per question when you took GMATPrep? (Note for future: ALWAYS time yourself so that you have that data after.) You almost certainly have timing issues (everyone does) and you *might* be able to get a little movement in your score in a week if you can begin to address some of those issues. (You can't totally fix timing in a week though.)
Do you know what your timing issues are, based either on this test or on other recent tests? If you've done an MGMAT CAT recently, you can use this to assess:
http://www.manhattangmat.com/blog/index ... ice-tests/Re: timing, I can advise you once I know what your issues are, but here are some resources:
short but crucial:
http://www.manhattangmat.com/blog/index ... to-win-it/http://www.manhattangmat.com/blog/index ... -to-do-it/Longer (and you won't have time to learn all of this, but still important):
http://www.manhattangmat.com/blog/index ... nt-part-1/You're also going to have to be aggressive about knowing your biggest weaknesses and cutting them off faster so that you're spending most of your productive time on things that you can get right or might get right.