I do think that holdmetight as some valid points in the hypothesized selection process. I'm sure they'll get in touch with another batch of candidates early next week for the apt test. I do think that it might be because of the limited resource they have for the apt test since only one person can work on it at any given time. If she said you'll be contacted within a week, give it at least a week.. and then some. You're still in the race as long as they haven't given you any bad news.