Sostenueto ditto - I'll be pleased if DS just gets what he needs and emerges unscathed too. Also, like your DGD, he's unlikely to get the target grades. He struggles with the essay based subjects for a start. He has never got above a 7 for geography, ever (so how the teacher put down an 8, I don't know). RE has been a serious challenge and I think he dropped marks all over the place on the Judaism paper. The sciences were put at 9s by the school, but he doesn't excel at them in the way he does at maths, so if things go well, he might manage 8s.
I think he'll probably get a decent set of grades with a disappointment or two, but mainly I hope that he gets what he needs for the sixth form.
If he doesn't get a 9 at maths, he's going to be really upset. But he's worrying me at the moment because he isn't doing a stroke of work for it outside of lessons. He is not a naturally confident person, but when it comes to maths GCSE, he just thinks it's going to be ultra-easy based on his experience in class over the last few years. I really hope he isn't setting himself up for a fall.