应该是必须三天前改,方法:
Online: Log in to your TOEFL iBT® Profile, click "View Order(s)" on your home page, then click "Modify" or "Cancel" on the Order Summary page.
By phone: Provide your registration number and full name used when you registered. In the United States, U.S. Territories or Canada: call 1-443-751-4862 or 1-800-468-6335. All other locations, contact your Regional Registration Center (PDF).
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