Charms was one of Sara's strong suits. She had been made to practice them constantly before Rui died, so she got an O with ease.
Defense Against The Dark Arts - O
Defense Against the Dark Arts was something Sara had practiced often and studied constantly. Even after killing Rui, she'd wanted to make sure she was ready for the next big thing, and so she always practiced, and got an O.
Herbology - E
Herbology wasn't quite as easy, but she did study hard for it and wanted to try to get an O. She ended up getting an E which was almost as good.
History of Magic - A
Sara spent less time on History of Magic. Though she found the class interesting, she didn't spend a lot of time studying and so she only got an A.
Potions - A
Potions was interesting, but not something Sara saw herself using too much in the future, so she only studied hard enough to pass the test with an A.
Ghoul and Ghost Studies - O
Being a werewolf herself, Sara was very aware of all the ghosts and ghouls around, so she was able to pass this test with ease.
Healing - O
Healing was something she was both good at, and completely interested in perfecting. Passing this test with an O came easily to her.
Extension granted to 7/7/2018 by ~ ♥ Cara ɱк