TRY, TRY AGAIN Thousands of former students in Texas and other states are still trying to pass old high school exit exams to earn their diplomas -- some for as long as a decade or more -- even though the tests have been replaced by newer, tougher ones. "I knew that if I wanted to make something of myself, I had to have a high school diploma," said Kimberly Howard of Fort Worth, who took the old Texas Assessment of Academic Skills exam 15 times before passing it. "I just kept going because I didn't want to be defeated," said...