<p>Our school system considers it “normal” to take Algebra 1 in 9th grade. So if you take it in 8th you are “accelerated”, in 7th “double accelerated”. It’s a little more complicated in math, but in the old days the college prep kids did Bio in 9th, Chem in 10th and Physics in 11th. So regular acceleration is starting the sequence one year early, double acceleration two years early.</p>