Some professors accept extra credit essays. These are all essays that were made public on the game. All essays were written by players on the game and have been posted "as-is".
1972-73
Ancient Runes
Charms
Herbology
Muggle Studies
1973-74
Ancient Runes
Arithmancy
Charms
Defense Against the Dark Arts
Hearth and Home
Herbology
History of Magic
Muggle Studies
1974-75
Charms
Divinations