Prerequisite course requirements must be completed at a regionally accredited university/college and you must have received a B– grade or higher. You can also take your prerequisites with us at Johns Hopkins. However, if you are transferring a course it must be a graduate-level course, the course cannot have been used to complete another degree, and your 5-year clock of completing your degree begins on the day you enroll in your first graduate class (including any transfer graduate courses).