The rankings are made by the Ed Dep't after evaluation. University facilities are taken into account, ratio of qualified teachers to students, papers published, research done, accuracy of paperwork, evaluation of individual teachers in class, discussions with the students, students obtaining work - basically all the same stuff we evaluate on back home, plus of course, value of gifts given. One uni I heard of gave each inspector a super fancy laptop, others have provided never-ending lavish dinners, massages (and all that entails) ....