Sound like a lot of you guys are getting stressed out over the tech. interview, don't. I came into ATC as a complete aviation industry virgin and the only knowledge I took into the interview with me was small bits I had gleaned from my airport vist (which was not much) and info from the handout by Mark Crane, which the company sent you. Armed only with this and a cheeky smile I passed my interviews first time and am now a valid controller.
Good luck to everyone and have the courage of your convictions with the scenario questions, this is where you make or break your "tech" interview, (in my opinion of course, others may disagree).