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Attention TDC Users: on Wednesday, December 13th between 8:00 AM and 12:00 PM PT, TDC will be migrating users who have been using the 2016 site onto the current, updated site. During the migration, the site will be temporarily unavailable, so please plan your study time accordingly. If you are currently using the 2016 site, please plan to print any practice exams/results you want to keep before the migration. When the migration is complete, your account on the 2016 site will no longer be available. If you have any questions or concerns, please contact Customer Support at

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