It's not her work though.
She's openly said that she gets Blakeney to read and summarise critical material for her, share her Notion notes for everything with Ruby, brief her on the reading before seminars and provide her with recap notes after lectures.
She's revealed that she skips the required reading in favour of a Sparknotes summary, and she's shown that she reverse-engineers an essay from the thoughts and opinions of other people, starting with an argument of someone else that she likes and working backward from there. That's not her work. That's other people's work mashed up and reworded into essays about books she never read. The only thing she worked hard at was avoiding doing work of her own.
Good for her if she found a way to cheat the system and get top marks for no original work of her own. But it's not her grade to be proud of.
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That's Exeter's criteria for a first. I find it incredibly hard that Ruby showcased "independence of thought and originality" when she's never shown any evidence of that in 7 years of content.
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And then the lower end of the scale, which lines up much more with the standard of language and writing we see regularly from Ruby.
Absolutely every piece of writing we've seen from her, from the essay samples to the poetry, from the book which she charges money for to her everyday conversations and professional business copy are riddled with errors on every level and I don't think she's ever offered up an original, coherent thought containing anything resembling intelligence or insight. I find it incredibly hard to believe that she was keeping a stash of exceptional talent in reserve just for her private essays.
You're right though, without seeing her final essay product or knowing what the hell the grading tutors saw, there's no way to tell why there's such a huge disparity between everything we've ever seen from Ruby and the grades she's been getting. They likely don't watch her content, so didn't see her outing herself as relying on every dodgy shortcut possible to avoid doing her own work, or they might've had more questions for her. But it's clear she relied almost entirely on the work of others to get there, she's all but said as much herself. If the criteria for a top mark is independent and original work, then she didn't earn those grades.
I kinda doubt she's going to show her full grade breakdown unfortunately, but I'd fully expect First overall and low grades (or lower than the Firsts that Ruby thought she was entitled to) for her dissertation and creative writing project.