No, we don't inflate scores - as you can imagine, that would be bad for our students because then they might expect to get a better score on the real test and, if they didn't, they'd be disappointed!
It is possible, though, to artificially inflate your scores yourself, if you do things like skipping the essays, taking longer breaks than normally allowed, eating and drinking during the test, etc.
Why do you think your score jumped from 670 to 760? Was there something that brought the 670 down or something that brought the 760 up? Or both?
For instance, maybe you took the 670 test right after taking another test, after studying for a while and burning yourself out, or maybe you messed up the timing and your score dropped in one or both sections. Or maybe you did something to artificially inflate the 760. Or maybe both - so maybe your "true" scoring level is somewhere in between?
If you messed up the timing at all in the 670 test, that has to be a major priority to fix. If you have timing problems, you can't guarantee that you won't have them again on the real test (unelss you fix them), and you can't hit a really high score with timing problems. This article can help:http://www.manhattangmat.com/blog/index ... anagement/
Also, in what timeframe did you take those tests? Make sure that you're not taking too many tests all in a row - you can burn yourself out and then have a crash (which is maybe what happened with the 670?) and you don't want that to happen on real test day!