Fourth grade. According to the announcement of official website, education bureau of shanghai, by the middle of 20021year, the fourth grade green index exam had come out in the form of an answer sheet. In order to adapt children to this test mode, mock exams are conducted three times a week before the exam. Answer card (also called information card) is the carrier of information input in optical mark reader, and it is the general name of various information input forms that support optical mark reader.