What's it really like at Westminster School?

I am a black girl from a working class family who got a full bursary and place to join the Westminster school sixth form starting September 2021. Be honest, what is it really like there? Both academically and socially. I've no idea as I'm coming from an all girls state school nearby (you can probably work that out). And will my background disadvantage me in any way, I just want to know what to expect when I get there.