This is what it's looking like for us:

DS13 - sophomore public high school (though the new principal said he would support DS taking AP English next year!)

DS11 & DS9 - 8th & 6th grades at charter middle school with some kind of advanced math accommodation (online? Community College?)

DS6 - 3rd grader at public elementary school PEGS class (grades 3-5 for IQs above 145)