At our very good public school in California, they give pull-outs and tutoring for the kids in the bottom 20% but nothing (until 4th grade) for the top kids.
My son's third grade class keeps going over money, telling time, briefly multiplication... it's very slow.... It's all about the test scores.
My son got in the "advanced" score (highest possible) last year on reading and math for the yearly STAR test given- that's gotten him nothing in terms of enrichment. He's in a class of low-performing kids this year, I guess b/c they sprinkle the high-performing kids around to even the classes out.
We are waiting until 4th grade when the g/t class starts- it's full-time and allows them to skip a year of math before 7th grade. Sigh... Welcome to NCLB.