是移民局要求的吗?美国考雅斯----I don't think so. If you are studying or working in USA, you don't need to 考雅斯. All this is to prove your English.能加快审理速度吗?---No还有,办fbi的无犯罪证明需要多久?--It take time. used to be at least 3 month.