Unfortunately, all the taster days have passed. Ds applied but didn't get a place on any of them (the college is very oversubscribed).
I can see DS possibly applying to Oxbridge but not necessarily going there, even if he gets an offer. I suppose our real target for him is to get a place on a competitive course at a really good university - one that is widely recognised for its excellence, and where he will be happy. I only mentioned Oxbridge to try to describe how the school, being a state comprehensive, doesn't really do much for the students not in the middle.
One of the things that makes the college appealing is that it prepares the students well for university. I think for many, it is an enormous jump, but the college teaches in such a way that I think the students won't see a huge difference in the way they are being taught and expected to work independently when they move on to university.
The main difference between the current school and the college is that the sixth form college teaches well beyond the curriculum whereas the school teaches to the curriculum, which has been a major frustration until now. Once you can do the thing that's being taught in class, the school thinks "job done", but the college just keeps on going. It would be a lot more demanding than school but since DS has been complaining for years of boredom, then it's frustrating that he doesn't want to grab it with both hands!
If DS does not get in a positive mindset, then he is at risk of failing the interview and not being offered a place as they are looking for people who want to go there.