One day, if we're lucky, YES College Preparatory School will have dozens of campuses across Houston. So far there are four. Well, five, actually, if you count the one about to go inside Houston Independent School District's long-struggling Lee High School. YES, which stands for Youths Engaged in Service, is the only charter school system in the state to earn an Exemplary or Recognized rating by the Texas Education Agency for every year of operation. About 80 percent of the kids are poor, 95 percent are African-American or Hispanic and 100 percent of its graduates gain admission to a four-year university — a requirement written into the school's charter. Students attend classes for nine hours each weekday, four hours on Saturdays and one month during the summer. Expectations are high. And, amazingly, they are met.