Her father challenged her to make a "perfect" score on the SAT. And this spring Amitha Harichandran, a Quartz Hill High School junior, met his challenge, bringing home a 1,600, the highest possible score on the SAT I: Reasoning Test. The junior scored 800 on the math and verbal portions of the test. Amitha said the score came after she took classes and practice tests for the aptitude and skills exam used for college entrance. "She's been a pretty good student throughout. She met my challenge," said Wijey Harichandran, her father. "She threw the challenge back at me." The 16-year-old...