GMAT Strategy

Hi All,
I would like to know if repeating the GMAT prep test 1 would affect the pool of questions for prep test 2. I took the prep test 1 twice and want to take it one more time. I am saving the prep test 2, to take it a week before my actual GMAT.
I want to do the prep test 1 one more time solely for the purpose of getting used to the timing and the kind of questions. While taking it the second time I did not find any repeating questions. Although my main concern is if I take test 1 multiple times, Does it deplete the pool of questions from Test 2. Any input on this query would be much appreciated. Thanks.