Dress like a winner. Arrive at least 15 minutes early. Brush up on your listening skills. What to do if you want to work for an Agency You need to find what are the exact job descriptions for the position you are applying for. Then you need to call the agency and find out which positions require an exam to be taken before you qualify for the position.
Some exams consist of a written exam while others consist of an actual interview.
Some agencies will allow you to take their exam and they will hold it on file for one year. This allows students to apply for positions before they graduate.