School query

Hello! An Australian year 11 Cambridge aspirant here. I had a couple of questions for the academic advisor panel here at Crimson Education. Do many of the students you usually work with (regarding Oxbridge) attend high-ranking/prestigious schools? Such as the top 10-20 schools? Or are some students also from a school that is not as high ranking? How does this affect the strength of the application?
Are your students always extremely academically talented and are ‘toppers’ in their cohort, or is this also not the case?
Many thanks,