The Associated Press reports that the high school class of 2006 has posted the highest scores on the ACT college entrance exam since 1991. A record 1.2 million test-takers took the ACT exam in 2006, which measures students’ readiness to perform college-level work. ACT scores range from 1-36, and 2006 saw a significant .2 increase in composite scores, from 20.9 last year to 21.1 in 2006…