double dosing
n.— «This school year EHS began doing what is called “double dosing” in math for ninth-grade students. Double dosing is a method by which students take two math classes, one being specifically for reinforcing concepts taught in the first math class.» —“WASL prompting new ideas at local schools” by Aimee Seim Columbia Basin Herald (Moses Lake, Wash.) Apr. 3, 2006. (source: Double-Tongued Dictionary)