If anyone needed to brush up on their Arithmancy skills it was Presley Black. The girl was practically mentally handicapped when it came to the magical precision of numbers. And being in Ravenclaw, mental handicaps tended to get you made fun of. So on her second day back, before they'd even had an Arithmancy class, Presley was in the lab studying her heart out. She was determined to get no less than an Outstanding in this OWL, but if she didn't improve soon, she was looking at an A or maybe even a P. Either of those grades was enough to make the fifteen year old burst into tears.

She would have asked for help, but ever since she'd snuck into the prefects bathroom in her first year she'd worried that Professor Hadley wouldn't want to help her, and would get angry with her for asking. So there she was, parchment and books spread out all around her, trying to make sense of the random numbers dancing across the pages.