A week before we were still doing the last of the practise papers.
The day before, we put the papers away and just played a couple of word games.
Each child is different, as the parent you know them best.
They may just want to chill, which would be okay too, as they know what they need to, by this stage.
What I did with each of the boys, a week before, was give them the present they had each wanted (the carrot) if they passed the exam. It gave them time to play with it and get used to their new toy. When I gave it to them, I also explained that, 'It didn't matter if they passed, the gift was for all the effort/work they had put into getting ready to sit the exam'. I was truly hoping it would help relieve a bit of the strain/stress for them.
For us parents on the other hand, well, stress goes with our hat