"Practice in the instructions until you are comfortable before going on to the test. It is much easier to understand after doing the practice a couple times."

This.

I practiced on one of the tests at least 10 times until I was sure. After all was done, I went to the proctor to apologize for how many times I asked for a reset and he laughed. He said he didn't care if somebody asked him 100 times to reset. He would do it until someone came in to tell everyone to go home. Like everything else on your interview, this is big. Make sure you're comfortable before proceeding.