you're considered independent by the federal methodology cause you're going to profressional school, so your FAFSA EFC is strictly based on YOUR income. you usually get a zero efc is you didnt work last year or didnt make very much money.
schools will take into account parental assets as well, so that EFC could end up not meaning much. For example, someone who has a zero EFC on the FAFSA but was in school last year and their parents made 250K last year could be worse off getting financial aid than someone (like my situation) who had an EFC of 5K and my family isn't that well off.