My school has an accelerated track that was developed a couple of years ago (Current juniors at my school were the first to have it implemented in their curriculum). Depending on the grade, about the top 10%-20% of “top performers” in the sixth grade are put on the accelerated math track. From there on out, students in this track are put in a separate class or join a math class in the grade above them to compensate for how quickly they learn mathematical topics. By the eighth grade, students in this program would have learned enough of algebra 2 and geometry to join a sophomore year honors class. Every year teachers evaluate these students to determine whether or not they drop from the accelerated track, and because of this I would say that there is a little more structure to this than just “Skipping a grade”. In terms of my own experience and performance in this program, I guess I have been doing fine since I have never been lowered in a math class.