In general, lots of money. Most do scholarships, so if your kid is really bright you might get one of those (usually reduced rather than no fees), they do this

In general, lots of money. Most do scholarships, so if your kid is really bright you might get one of those (usually reduced rather than no fees), they do this to bump up their examination results. Connections seem less important now than it used to be, but many will give preference to those whose parents or siblings attended.