Using published figures, among the schools and colleges with the highest number of Oxbridge admissions are:
Westminster School, London (independent) – an average of 70-80 pupils each year have been offered places at Oxford and Cambridge in the last five years, the school says
Eton College, Berkshire (independent) – in 2014, 82 students were accepted to Oxbridge. The following year 68 were accepted
Hills Road Sixth Form College, Cambridge (state sixth form college) – an average 60 pupils receive Oxbridge offers, the school says
St Paul’s School, London (independent) – 53 students went to Oxbridge in 2016 and 41 in 2015
Peter Symonds College, Hampshire (state sixth form college) – an average of 48 students received offers from Oxbridge over the past three years
St Paul’s Girls’ School, London (independent) – an average of 45 students went to Oxbridge each year between 2015 and 2017
King’s College School, London (independent) – sent 48 students to Oxbridge in 2017
Magdalen College School, Oxford (independent) – 44 students went to Oxbridge in 2018
Anti-Catholic bias I call that.
And what a surprise to see that the children of Oxbridge academics get into Oxbridge?