Simplify the following text for a Grade 10 native English-speaking person.
Original: At the graduate level , the Rackham Graduate School serves as the central administrative unit of graduate education at the university . There are 18 graduate schools and colleges , the largest of which are the College of Literature , Science , and the Arts , the College of Engineering , the Law School , and the Ross School of Business .
Simplified: Most graduate students go to the Rackham Graduate School , the College of Engineering , the Law School , the Ross School of Business , and the Medical School .