Add Thomas Hsu to the growing list of IUSD students who have earned perfect scores on the SAT. Hsu, a junior at University High School, recently learned that he aced every multiple-choice question on the famed college entrance exam. But what makes this tale all the more extraordinary is that his older sister, Tiffany Hsu, also scored a flawless 2400 on the SAT when she took it three years earlier. The Orange County Register has the story here.