So after E, it’s A for ...

So after E, it’s A for ‘Acceptable,’ and that’s the last pass grade, isn’t it? Yep, said Fred, dunking an entire roll in his soup, transferring it to his mouth, and swallowing it whole. Then you get P for ‘Poor’  — Ron raised both his arms in mock celebration — and D for ‘Dreadful.’  And then T, George reminded him. T? asked Hermione, looking appalled. Even lower than a D? What on earth does that stand for?  ‘Troll,’  said George promptly.
So after E, it’s A for ‘Acceptable,’ and that’s the last pass grade, isn’t it? Yep, said Fred, dunking an entire roll in his soup, transferring it to his mouth, and swallowing it whole. Then you get P for ‘Poor’ — Ron raised both his arms in mock celebration — and D for ‘Dreadful.’ And then T, George reminded him. T? asked Hermione, looking appalled. Even lower than a D? What on earth does that stand for? ‘Troll,’ said George promptly.

Quotes from the same author

Raindrops the size of bullets thundered on the castle windows for days on end; the lake rose, the flower beds turned into muddy streams, and Hagrid’s pumpkins swelled to the size of garden sheds.
He didn't realize that love as powerful as your mother's for you leaves its own mark.
I am prouder of my years as a single mother than of any other part of my life.
So why in the name of Merlin’s saggy left — Don’t talk to your mother like that.
Hermione drew herself to her full height; her eyes were narrowed and her hair seemed to crackle with electricity. "No," she said, her voice quivering with anger, "but I will write to your mother.