Sat for an aptitude test first and in less than 1 week, got a call anf was told to come for a site test and interview. The site test was not really a test but more like a way for the trainers to observe how you behave throughout the site visit - e.g. did you listen to instructions etc. After the site test and refreshment, then the candidate will be called one by one (not in order) into another room for the interview.