read the annex to the welcome letter. Many factors are considered. For instance, the department that you were assigned to may really need those who are exceptional in the competency measure that you performed best at, to meet a specific requirement. If you want a career in the Civil Service in the long term, remember that beyond the FS grade, you can apply for positions across the Civil Service, and specifically in the department that you are most interested in. You may also likely go on secondment at some stage, with another department. You can network and keep an eye out for specific opportunities in the department you most want. Furthermore, as they advise, you may find that you fit better and enjoy working in the department that you were assigned to, a lot more than you originally anticipated.