To cancel or reschedule your DAT appointment, you must contact Prometric, the testing service provider. Cancellations or rescheduling can be done through the Prometric website or by phone, subject to rescheduling fees. Before you reschedule your appointment, you’ll have to pay additional fees in advance. It should only be done 24 hours before the exam dates during the working days. Candidates will receive a notification regarding rescheduling or canceling of the exam.