I was asked to complete a practice exam before coming to the interview, to see if I was eligible. Then afterwards, I was asked to come in for a sit-down interview. After the sit-down interview portion, I was asked to teach in front of the recruiters.
It was fairly straightforward. Great people, although you did have to take an SAT! Luckily they assured me that they could train me up if I didn't hit the score they needed.