If you know the examination room number, you will know the admission ticket, because 10 people in front of the same school are all the same. If the examination room number is the same, then ask the students you know in the same examination room (some schools are arranged by ID cards, and each examination room is basically a fellow villager, you should know), or ask the students in the next examination room to infer your examination room number from memory, but you really can't remember the seat number. There are only 30 people in an examination room.
Or you can call the National College English Test Office. National College English Test Committee for Band 4 and Band 6 Tel: (02 1)62932756. ?
Beijing, Tianjin, Hebei, Shanxi, Inner Mongolia, Liaoning, Jilin and Heilongjiang, tel: (0 10)62772338, Shanghai, Jiangsu, Zhejiang, Anhui, Fujian, Jiangxi, Shandong, Guangdong and Hainan, tel: (021) 6238.