Is that "normal" - children who are bright average work 1-2 grades ahead and children above bright average (like Superior and higher) work more than 2 grades ahead?
According to the chart posted on pg 1 of this thread, I guess that is typical. Of course, I would have to assume that this is given reasonably decent teaching that is geared toward teaching somewhat above avg for an above avg kid.
eta: (prefaced with the note that both of my dds are gifted to some degree, so in that superior-very superior range on IQ tests) anecdotally, dd#1 works on average 4-12 grades above level in her areas of strength depending on the year and how high the achievement tests she takes go each year and btwn 2-4 grades above level in her weaker area (math). Dd#2 is such an erratic human being, that it is hard to say where she is working from day to day.