After a student registers for examination, he may register for non-required review hours not to exceed five hundred (500) clock or equivalent number of credit hours. The non-required review hours remain on file but shall not be credited toward an examination. Review hours that are required for the applicant whose license has expired may be credited toward the appropriate examination as in Rule 175:10-9-33.
Okla. Admin. Code § 175:10-3-71