Hi ggurface,
Seeing any number of repeat questions on a CAT can significantly impact your performance scores (and almost always leads to an 'inflated' score result). Since the scoring Algorithm on the Official GMAT is more complex than most people realize, there's no exact way to determine what those repeat questions did to your score (and it's never as simple as "I saw X repeat questions, so my score is Y points higher").
Based on your overall practice scores, assuming that you took your other CATs in a realistic and test-like fashion, you look to be in good position to score 700+ on Test Day. Remember that the GMAT will give you the score that you EARN, so you have to work hard to earn all of those points.
As a general rule, it's advisable not to do too much work in the final days leading up to your Official GMAT (so no "cramming" and no CATs). You'll be better served by keeping your studies 'light' and getting some extra rest.
GMAT assassins aren't born, they're made,
Rich