We homeschool, but the public school gifted program is a full-time self-contained gifted program which does allow kids to move at their own pace. For example, I know of a 1st grader doing 4th grade math, and a 7th grader doing pre-calculus.

The public schools here are overall horrendous, and you have to venture into high crime areas to get to the gifted programs, and have your kids used as score pawns, so we abstain from the whole system.