School Policies Written on 07 September 2014. OSHS Graduation 2014 Graduation Requirements A student must have a combined average of 75% and completed no less than 270 clock hours (of the 300 clock hour program) to pass the course and receive a diploma from OSHS. A progressive grading system, using weekly scores and a three-part final examination, which includes written, forge, and shoeing tests, determines the final grades. Diplomas are presented on the 29th day of class unless a student has three unexcused absences. A student with no more than three unexcused absences must attend a make-up day on the 30th day. A student must be here the last day of a class to receive a diploma.