Millbrook High School uses a block scheduling system, utilizing Day 1 and Day 2 schedules. Each block is one and a half hours long and meets every other day. The school also uses a traditional 4 quarter system with each quarter lasting 9 weeks.
Athletics
Millbrook High School plays in the AAAA Northwestern District. Despite its short athletic history, it has established strong programs in football, golf, volleyball, tennis, cross country, basketball, track, swimming, baseball, wrestling, soccer, and cheerleading earning numerous district titles and back-to-back regional runner-up and regional titles in basketball. As of the 2013 season, the varsity girls' basketball had won a Virginia state record 84 consecutive games and became the first school in state history to win three consecutive state championships.[2][3]