is this a one time payment or not?

29/06/15
is this a one time payment or not?
i want to buy the full test but i am wondering how it works
if its a one time payment for the full test and i can practice with that all i want ? or
if its a one time payment for a one time practice ?
or if there is a limited time for me to practice?

DiKaKo
30/06/15
Full TOEFL Practice Test
Dear GilCruz,
Our TOEFL tests are really close to what you will get on the actual TOEFL exam. Therefore, some real people are involved into scoring the listening and speaking section of the tests. Thus, there is no option that you can practice more than once with one test. If you want to repeat the same TOEFL prep test you will need to purchase it once again. Further, practicing with the same test for second time won't get you an objective result as yo already know some of the questions, you have read the texts before and you have listened to the lectures and conversations included within this particular TOEFL test.