There is generally no problem in not filling in the seat number on the back of the answer sheet in the college entrance examination. Generally speaking, even if no personal information is filled in, the first invigilator has the obligation to remind him. Secondly, as long as there is a bar code and examinee number, there is no problem if your AB seat number can be verified.

Brief introduction of answer sheet:

Answer card (also called information card) is the carrier of information input in cursor reader, and it is the general name of various information input forms that support cursor reader. The information card converts the information needed by users into optional options for users to scribble. OMR equipment sets recovery information according to painted and unpainted information points and format files.

The pattern of the information card is designed according to the information input into the computer and the format required by the design specification of the optical mark reader.

Refer to the above? Baidu encyclopedia-answer sheet