Secret, you are right. We live in a bit of central London where state schools are very poor (and so full that DS did not get offered a place). Options were to move, find God, tutor for a Grammar or pay - with DS ending up in one of those big name schools where the teaching is first rate. There is no way DS would be in a position to apply for a RG University had he gone to our local secondary. They did not even offer the top tier for maths GCSE. Another local school cancelled science lessons for a term as they could not recruit a teacher.
It is very different from my own dippy schooling. There is almost an educational arms race out there, more evident perhaps with the ex-pats aiming for Ivy League where the achievement has to be in music, sport and leadership as well. (I lurk occasionally on the 3+ tutoring thread in Primary Education, when I need confirmation that some of the pushy parenting I see is not just a figment of my imagination, and one of the funniest recent threads was one started by Statesmom looking to get her son into Westminster.)
We know DS is lucky. He got into his school before competition for places got out of hand, and before the tutoring started in earnest. He has good, experienced teachers. As it gets harder to secure a place on a high-demand course his school is better placed to push students to meet requirements.
The requirements do seem to be getting harder. A to A* to STEP. Some, I think, is caused by overseas demand for world ranking University places. Some then, by traditional applicants raising their game. Like Central London house prices, demand keeps growing.
I am sure Universities will want to help. They also want to retain their world rankings by recruiting the best and the brightest, and will be wary of those whose potential is not proven and who may struggle to catch up. There is a limit to the extent that they can help fill educational gaps without weakening delivery of tertiary education. However they must know that many schools wont be in a position to help prepare for STEP, and that students will be left essentially on their own.
I think it is awful, very unfair, and a huge waste of potential.
What level STEP is he having to do? DS refused point blank to consider economics courses which required STEP. He tells me it is really very hard, even for strong and well-prepared mathematicians.