"I'm sitting here - someone privately educated, who was lucky to have grown up juggling the expectation to achieve top grades while pursuing a range of extra-curricular activities and therefore arguably primed for a life of balancing"
I don't this is an adequate acknowledgement of her privilege tbh. She's placing the emphasis on how much exceptionally demanding, technically difficult work she had to do. She's still trying to squeeze in a bit of "My success is a result of MY ability to meet high expectations".
Private schools' high expectations are only possible because of their exceptional facilities and comparatively good treatment of their staff, which in turn only exist because of their funding. They are better staffed and the teachers are better paid, much less stressed and generally more qualified. The teachers would've been able to spend much more time supporting not just Grace's individual, core education, but also her extracurricular activities. And unlike in state schools, in private schools, you can reasonably expect most pupils to have access to tutoring and other support outside of school, which again decreases teachers' workloads. By and large, private school pupils wouldn't have had to share one computer, one desk or study space, or one bedroom, and wouldn't have
had to support their parents financially or with housework. More time spent focusing on education = better class progression. Where private school kids get a Grace Beverley to babysit them, parents of state school kids in poor families often have no choice but to leave their children home alone whilst they work a late shift.
Grace's school would've offered a wide range of subjects and facilities - every class would have been offered e.g. triple science and language GCSEs, rather than just a few kids as is common in state schools. Pupils wouldn't have had to travel for PE. Private schools don't have to worry about failing an OFSTED inspection, and consequently, their teachers don't have to worry about being sacked as a result of a bad inspection.
They are able to provide pastoral support, which many state schools can't, not effectively.
Grace, don't preface a conversation like this with a little humblebrag about how much your minted school expected of you and how multitalented you are - it's disrespectful and inappropriate :/