Enrolled students who can demonstrate evidence of expertise are eligible to apply for a challenge examination, which has been approved by the appropriate school. Challenge examinations may not be repeated and may not be taken for a grade replacement for previously completed courses with grades of "C-" or below. All challenge examinations must be administered and graded prior to the start of the course. Successful completion of a challenge examination results in the listing on the student’s permanent record of the course equivalent, with the notation 'credit by examination', and the amount of credit granted. Challenge exams are not repeatable. A student may test out of no more than 25% of the courses needed for graduation.