MMA did not have Houses. MMA students were grouped with all the other students who were the same year in age, as of 1st September of the school year in which they started MMA. If Harry and Hermione started school at MMA on 1st September 1995, they would both be in the "Fifteen group," even after Hermione turned sixteen; Harry and Hermione would remain in the "Fifteen group" till 1st September 1996. Furthermore, Harry and Hermione would spend this year being part of the "Fifteen group," no matter whether Harry and Hermione were taking fifth-level classes, first-level classes or seventh-level classes. The seven year-groups at MMA each had their own common room; an eighth common room was set aside for "Siblings, Spouses, and Level-Mates."