<p>Ah, this could either be due to differences in mailing dates and/or pool differences (taking PSAT/PACT or SAT/ACT) and/or score differences. My best guess is by the end of May people who have received one letter from either HYP will receive one from the other two, I’m sure Harvard, Yale, or Princeton would not want one school getting more face time than the other from potential students.</p>