DS2's current school's sixth form is business attire, but at the moment he is keen to go elsewhere, so who knows where he will end up. We are spending some time in the first term going to open days to see where else might be suitable.
Re homework, only the maths teacher and the art teacher formally set any - with maths being only two booklets (couple of hours each). Art was quite a bit, I think, although I am a bit confused as to what was actually set, and what was DS2 thinking he needed to do himself. He has spent quite a bit of time working on Seneca, and I signed him up for Tassomai (both of these came from mumsnet, not school, Seneca he tried earlier as it was free, but we waited until the holidays so he could experiment with Tassomai and decide whether it was worth the fee. The good news is that Seneca is doing his Geography board, which is a relief, at least somebody is).
He has also been trying to work on his French oral questions (the French teacher did expect this, but not exactly formally set). French is the most scary one of all. The most likely cause of meltdown is French. We just had one today, because the oral is not going right. Very few of his classmates are working, I think (except all of Set 1 are sufficiently scared of the maths teacher that they will all do their booklets), but as mentioned, DS2 puts himself under enormous pressure and there was no way he was not going to work these holidays. He took one week off to do a musical theatre week, and then we spent a bit over a week in France (DS1 in respite). I chose France because I figured being there might help a bit, which it might have done. But the rest of the time he has been doing several hours a day (although quite a bit of that is art). In a relaxed fashion though, along with sleeping in, and a fair bit on the computer (he plays some sort of online game in which you control a country and have international relations with others, and another where he runs a budget airline!, he also watches a lot of musical theatre on youtube and the like) so I don't think he is exhausted at this point. We also took him to a number of shows this summer (thank you kids week!), which is his favourite thing to do in the world. But the French (particularly the oral) isn't as far along as he wants it to be, hence the meltdown today.