I'm doing it.
Considering I know i got pretty much full marks on coursework, that makes it little easier for me - but DT GCSE is my worst subject and I am scared for it. For me the worst thing is that recently the mark scheme changed completely. If you look at 2010-2014 mark schemes, you will notice that they pretty much reward all valid points. But in the 2015 paper they require you to put certain things down:
For example, in a question about "shaping the product", you had a maximum of 2 out of 4 marks fro marking out and a max of 2 out of 4 for details about cutting - whereas in 2010-14, you could get 3 for marking out and 1 for cutting, or vice versa - pretty much anything true was rewarded. It was also a lot stricter in 2015.
For me I can do all the essays and generally I can do the "make a trophy" questions, but the weird questions about materials/properties and what mechanisms are in some products I find really hard.
Overall I'm hoping for an A* (about 85/120) and in past papers I have been getting the A* regularly, but if hard questions come up; or if section A is weird, then I will pretty quickly drop to an A.
By the way, what do you think section A will be? I'm hoping either some sort of kneeler/sitter for the elderly, a storage unit or something to help them use their tools.