Have to say, I think this is one of those personal thing-ies...
As a family, we don't have any secrets ever, so for me not to have told my son would have meant him never trusting us again. We worked towards it and I thought this was the best way to do it.
Some friends of ours, who I think are fab parents, surprised me by saying they were not going to let their daughter know the date, I was amazed and surprised but they explained that despite being bright, she hated exams, would definitely not sleep the night before, would definitely make it a big focal point in her life and they felt it was best for her.
She only just passed (and we did not
) possibly because of nerves on the day and afterwards said she was so glad she didn't know the day was approaching. I think her parents got it dead right for their child. It really wouldn't have suited our son, it would have been so out of character of us, he wouldn't have known where he stood after that.
So, an interesting one but I think quite a personal one as well.