Go to aviationinterviews.com and find your target airline. If you know there will be a test, the questions or questions like them will be there. Wear a clean suit which fits. Get a haircut. Be on time and be organized with your papers. Be relaxed and not overwhelmed (that is the hardest part). Find out everything possible about the company you are interviewing with. Be friendly and courteous and professional with everyone you meet, especially the receptionist, because they are likely being asked their opinions about you. Be serious, but not too serious. Treat everyone with respect, but do not worship. Be honest in all your answers. They probably don't believe you if you tell them you hope to retire as a captain on the Beech 1900 when you are 60.