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An examinee may take the examination twice within a thirty day period, if necessary. If a third attempt is required, the examinee must wait at least sixty days from their last attempt.
There is only one legitimate reason for an examinee to re-test:
The examinee did not pass the examination.
To re-take the certification exam, contact the individual or group that facilitated your initial certification exam and tell them that you want to re-take the exam.