“ ‘m not an idiot, Hermione. I can pass without your help, thanks.
— Wot’s the quiz on again?”

"If it wasn’t for me, you wouldn’t pass half of your classes. It’s not that you’re stupid, it’s that you’re lazy. You can’t expect to get anything done when all you do is either sleep, eat or chatter on about Quidditch.“
She sighed. Figures.
"How do you expect to pass when you don’t even know the subject?"
”–potions, Ronald.“
“Well I guess it’s good we’ve only got two hours then, isn’t it? So, y'know, keep it short. And easy to understand and...
She glared at him. “You haven’t got a clue, do you?” Not that she knew what was going on either, but it was clear...