Student has all the answersJunior who conquered new SAT 'just has a history of being perfect'09:27 PM CDT on Friday, April 22, 2005By APRIL KINSER / DallasNews.com Erin Yu had to look twice as she checked her SAT score online last week. A perfect score – 2400 – beamed from the computer screen next to her name. "I was like, 'Oh, my God!' " said Erin, a 17-year-old junior at Plano Senior High School. "I was in a good mood for the whole day." Erin was the only student in North Texas to ace the new college entrance exam, one...