I went to a very ordinary Welsh Comp.
It sent students to, the now, Russel group, med schools, Oxford and many other universities. Very many of us got our, aspirational, first choices. Not that we knew anything about words like aspirational. We just knew what we wanted to do.
Yes school was supportive in handing out UCCA handbooks and application forms and nagging about dead lines, but the rest was up to us. We wrote of for information, red prospectus and chattered endlessly to each other.
This was a rural area many of my friends did not have university educated parents. However, school encouraged us to get good grades and we encouraged each other. Most of us had checked our O'level options were suitable and all of us knew what A'levels we needed.
The idea of applying to some where easier, except as fall back, didn't enter our heads. We never felt any less worthy because we were at a comprehensive in the middle of nowhere.
BUT back then the media weren't telling us every 5 minutes that only Private school children and Grammar school pupils stand a chance. We only very dimly knew such places existed