Board Thread:Questions and Answers/@comment-2600:1700:9480:9B20:6C1A:3FA8:C3CF:86C2-20171010112910/@comment-5780397-20180425031013

You have to register before December 31st to take the Exam (chapter 146). The signature of a parent/guardian is necessary for registration (chapter 1), but Killua may have easily forged it both times, given his background.