Because you've done 6 tests already, it is possible to see repeated questions in your second set of 6 tests. (You'll also see some new questions.)
How much will you remember? You won't know till you try one and see. :)
Before you do anything else, though, read this (right now - go ahead):
https://www.manhattangmat.com/blog/inde ... many-cats/So... this time, you're not going to take 6 tests in 2 weeks, right?
In your second set of 6 tests, you won't see repeats among the tests. Your second set of tests will be called the "A" series. After you take test 1A, you won't see any repeated questions from that test on test 2A or any repeated questions on 3A. The only repeats will be from the first set of 6 tests.
Do NOT go back and look at / study from any of the old CAT problems. You'll forget a lot of them over time - it's already been 2 months.
A few remembered repeats aren't a big problem as long as you follow a few guidelines to minimize the chance of artificially inflating your score. First, anytime you see a problem that you remember (and this means: I know the answer or I'm pretty sure I remember the answer, not just "hmm, this looks vaguely familiar..."), immediately look at the timer and make yourself sit there for the full length of time for that question type. This way, you don't artificially give yourself more time than you should have.
Second, think about whether you got this problem right the last time. If you did, get it right again this time. If you didn't, get it wrong again. If you *completely honestly* think that you would get it right this time around if it were a new question (even though you got it wrong last time) because you've studied that area and improved, then get it right this time.
You may not even need a new test right now, today, though. If you already have a pretty good idea of your strengths and weaknesses, go spend several weeks tackling those things before you take another test. That's even more time to forget about the old questions. :)
If you haven't yet done GMATPrep (available at mba.com), then you can also try those - there are two free tests there.