The CATs are not "set" exams. Rather, there is one large database with >1,000 questions in it and your questions are drawn from this one database as you take each exam.
We guarantee 6 "clean" exams—meaning, you will not see any repeated questions in your first set of 6 exams. After that, you can continue to take more exams, but it is possible to see repeated questions. In order to start a second set of 6, you do need to "reset" the pool—but this just means that you're confirming that you understand that you could now see repeated questions. (You will also see new ones—as I mentioned, there are a lot of questions in the pool, way more than you actually see on 6 exams.)
Also, you will not have any repeats *within* the second set of 6 exams. For example, your first exam in the second set of 6 will be labeled #1A. That exam could have repeats from any one of the first 6 exams (numbered 1 through 6). When you get to exam #2A, that exam will not repeat any questions from exam #1A—but it could repeat questions from any of the first 6 exams (numbered 1 through 6). This will continue for the rest of the second set of 6 exams.
Some people see a lot of repeated questions. Others don't. It depends partially on how much your scoring levels have changed—if you have increased your scores quite a bit, then you will be less likely to see repeated questions because you will no longer be offered questions at those lower levels. If, on the other hand, your scoring level has been roughly the same the whole time, then you will be more likely to see repeats because you are pulling from the same area of the database.
There is also the question of whether you will remember any repeated questions that you do so. If you don't remember the question, then it's like a new question for you—it doesn't matter that you really did see it a year ago.
If you bought the exams on our website and you would like to discuss the possibility of a return / refund, please contact our student services team (
gmat@manhattanprep.com or 800.576.GMAT in the US and Canada).
I will mention that you can still take both GMATPrep and MGMAT CATs even with repeats as long as you follow a few guidelines to minimize the chance of artificially inflating your score via question repeats. 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.