 Students may also opt to complete 4 HL and 2 SL subjects if they wish although it is not recommended due to the potential for the exorbitant workload Successful completion of the IB program entails receiving passing grades on all written IB examinations, the Theory of Knowledge essay, and the Extended Essay, as well as 150 hours of volunteered community involvement in three areas (i.e.creativity, action, service; also known as CAS hours).In their final year, students write the official IB exams in May.