Be sure to show up on time for the interview. This is part of the test - to see if you can show up on time. If you are late to the interview, they may assume you will be late to a job they place you at. So show up early.
You will take the following tests, administered by computer
Dress as you would for going to work at an office.
If you wear jeans, they will think of you as a common laborer.