WordNet sense 1 (a person who has received a degree from a school (high school or college or university)):

alum, alumna, alumnus, grad, alum

WordNet sense 2 (of or relating to studies beyond a bachelor's degree):

postgraduate

WordNet sense 3 (greater than normal in degree or intensity or amount):

high

WordNet sense 4 (make fine adjustments or divide into marked intervals for optimal measuring):

calibrate, fine-tune