PT88 will actually be the upcoming September 2019 administration. As the previous poster commented, July was non-disclosed, so we'll never get to lay eyes on it again (I have mixed feelings about that, as I feel personally attacked by it ;-).
Go to Resources, then Problem Sets/QBank. Create a problem set using PT88 LG. If you want to take the section multiple times just click on the section in your problem sets and hit the "+" icon in the bottom left once it pops up.