DS1 did almost exactly the same - he got CCCE. Although he did re-sits and got the Cs up to Bs, by the time he had done those his UCAS form had already been sent off, and his college only used first results as their predicted grades.
As we knew the latter would be the case, it meant that he had to 'downgrade' the universities that he applied to.
Based on our experiences, there is absolutely no point applying now to a university with an entrance requirement of AAA-ABB if those are his AS results.
I'm sorry if that isn't what you want to hear - and it may be that it's different at your school in terms of what they are prepared to say re predicted grades - but certainly for us, this was the case.
The good news was, because he chose universities to apply to that had lower entry requirements for their courses, every one of his five choices made him an offer.
However, come the A2s, DS1 worked really hard (AS results were a real kick up the backside), and achieved AAB. This left us in a real dilemma because although he way exceeded the entry requirements/offer of his firm choice university, he was left knowing that he could have applied elsewhere in the first place!
So we've gone through what has been really traumatic experience of turning down his place and he will be re-applying to go next year.
I say 'traumatic' because now we have to go through the whole application process again - the personal statement, the choice of university, hoping he gets offers, etc, etc. And all this has to be accomplished in the next couple of weeks. Never mind wondering about what DS1 is going to do over the next year!
IMO the current system is stupid. I think that none of them should apply until they have their actual grades.
If I were you, I would suggest that you think hard about applying next year, and then think about what your son does in his gap year that will enhance his application.
I've spoken to several admissions officers now, all of whom were very encouraging and said that this is not an unusual occurrence. The advantage that you will have, of course, is that your son will be applying with his grades and, if he applies early (i.e. before the end of September 11) he will stand a very good chance of getting a confirmed offer very quickly.
Good luck to you and, especially, to him. It's such a fraught time!