; (iii) while enrolled in such course of study, to maintain an acceptable level of academic standing (as determined by the Secretary, taking into account the requirements of the institution of higher education offering such course of study); and (iv) to serve, through full-time employment at an eligible school or eligible service employer (as described under section 259B or 259C, as the case may be), for a time period (referred to in this section as the period of obligated service ) equal to the greater of— (I) 1 year for the equivalent of each school year for which the individual was provided a scholarship under this subpart