Top 10 "feeder schools", and the percentages of their graduating classes who attended either Princeton, Harvard or Yale

Top 10 "feeder schools", all of which are private, and the percentages of their graduating classes who attended either Princeton, Harvard or Yale:
1. Roxbury Latin School, West Roxbury, Mass.; 21.11 percent.
2. Brearley School, New York; 20.90 percent.
3. Collegiate School, New York; 20.00 percent.
4. Groton School, Groton, Mass.; 17.86 percent.
5. Dalton School, New York; 17.58 percent.
6. Spence School, New York; 17.16 percent.
7. Horace Mann School, the Bronx, N.Y.; 16.77 percent.
8. Winsor School, Boston; 16.74 percent.
9. Milton Academy, Milton, Mass.; 15.84 percent.
10. Phillips Academy, Andover, Mass.; 15.68 percent.
The highest-ranking public feeder schools, with their overall ranking and the percentages of their graduating classes who attended either Harvard, Princeton, or Yale:
26. Hunter College High School, New York; 9.36 percent.
59. Princeton High School, Princeton, N.J.; 6.30percent.
71. Thomas Jefferson High School for Science and Technology, Alexandria, Va.; 5.89 percent.
81. Scarsdale High School, Scarsdale, N.Y.; 4.91percent.
87. Bronxville High School, Bronxville, N.Y.; 4.71 percent.
90. Millburn High School, Millburn, N.J.; 4.64percent.
101. University of Illinois Laboratory High School, Urbana, Ill.; 4.26 percent.
102. Academy for Advancement of Science andTechnology, Hackensack, N.J.; 4.21 percent.
120. Stuyvesant High School, New York; 3.67percent.
142. Weston High School, Weston, Mass.; 3.22percent