You are not required to retake a written exam if you previously received a valid passing score. Your exam score remains valid until Human Resources changes the written exam. If you opt to retake a written exam, your most recent score (pass or fail) is the prevailing score. For “FAIL” exam scores, you must wait (3) months from the test date to re-take the exam. For “PASS” exam scores, you must wait (6) months for exam re-take.