If you were using the GMATPrep software, that is the closest indicator of the real test - however, even that software is not THAT close.

The official test has a standard deviation of 30 points; the standard deviation for GMATPrep has not been published, but it is going to be higher than 30, since it's not actually the real thing. I'd guess probably around 40 or so.

That means that you are certainly in the range to score 700+ on the real test (but there are no guarantees, of course).

Also, GMATPrep starts to repeat questions after the 2nd test, so you should factor that into your assessment of your score improvement, if you saw questions more than once.

I don't know of any other high-quality free tests, but most companies (including ours) will let you take one practice test for free, and our company will also allow you to buy access just to the practice tests and nothing else. See our web site for details.