过期的TOEFL成绩怎么办?

我打电话给ETS，结果TOEFL 过期了，不给寄成绩。现在学校说让我send a certified copy of your examinee score report (certified by your local British Council or university) 那怎么叫做certified by your local British Council or university？？？请指教。多谢多谢。