My A levels, in the early 70s, were linear too. That's neither here nor there.
Our local comprehensive, the only one for about 9 miles in a rural catchment, is never going to rival any selective school's results. That in itself is not a debating point; it also offers BTECs and is highly regarded for some vocational courses. But its A level track record is steadily unimpressive, so all those bright aspiring students from unprivileged/normal working families are really not given a picture of what excelling looks like from any direction. Even the teachers don't know what Oxbridge potential looks like, so they are content to suggest that the students aim for university, but at a shade or two below what might be possible if they pushed a little harder. In an era when three years of university fees and living costs is likely to leave a debt of £40k, often more, I do feel that realism ought to kick in earlier before dreams are smashed to smithereens.