Gwen Caudwell, head of the Cambridge Assessment Test Development and Admissions Coordination Department, explained why the answers in the presidential schools entrance exams are written in pencil:
- Answers are checked using special equipment. Marking the answers in pencil allows the candidate to change it when he makes a mistake and choose another answer. When this is done with the pen, it is not possible to delete wrong answer. The special apparatus does not accept corrected answers by pens.
