@bluegoosie As a very experienced head of science I disagree with almost everything you are saying about combined science.
I hope you are not rejecting students from university courses because they chose not to narrow their curriculum at the age of 14 with triple as one of their options.
Schools that teach triple in double time can only do so by covering material too quickly to enjoy it or teach for deep understanding, which is what you are claiming triple brings.
Triple does not offer a massive step up to A level. It covers a couple of topics briefly that save an hour or two each at A level. And if the topic isn’t taught by Christmas in year 12, they’ve all forgotten half of it anyway!
The exam boards are required to check that the grades in triple and combined are equivalent in standard so the triple papers are not more difficult.
@Hollyhedge Is it possible the school have considered how much revision your DS will need to do to raise the grades at triple? It cuts the work by a third if he changes to combined. If he’s getting lots of knowledge questions wrong, especially in the triple only topics, then he will find it easier to get two higher grades at combined.
However, I understand your reasoning for sticking with triple and, in your position, with the information you’ve given, it’s probably what I’d advise. (You could always try getting him to sit and mark the double papers to see what grade he comes out with.)