Ohio Revised Code Title XXXIII. Education Libraries § 3365.031

(A) A student in grade nine may not enroll in courses under this chapter for which the student elects under division (B) of section 3365.06 of the Revised Code to receive credit toward high school graduation for more than the equivalent of four academic school years.  A student enrolling in courses under this chapter may not enroll in courses in which the student elects to receive credit toward high school graduation for more than the equivalent of:

(B) The restrictions prescribed in division (A) of this section shall be reduced proportionately for any such student who enrolls in the program during the course of a school year in accordance with rules adopted under section 3365.02 of the Revised Code.