Start with the aptitude testing, soon after you get face to face interview with 2 people (one union, one non union) shortly after you have to do a group project with some of the other guys in the interview session. All the interviewers which is about 20ish of them sit and observe you working together to solve the situational problem. As long as you work well with the group, don't discourage others input, but don't sit back and let everyone else do the work; you should be fine.