D6 Diploma Exam Retake $338.00 Registration is due no later than 2.5 weeks before the submission date (January 30 or July 30). Exams › D6 Diploma Exam Retake Dates: January 30 Submission July 30 Submission Get notified by email when this product is in stock. Quantity: Purchase Added! Registration is due no later than 2.5 weeks before the submission date (January 30 or July 30).