I think all I can say, is as long as you can honestly say to yourself you tried your best and worked your hardest - that is all you can do and you should be proud of yourself.
Go into your exam on Friday and feel at peace that you've done all you can.
If it doesn't go your way, there will be other opportunities in the future. My Dad was managing multi million pound budgets and finally got his Maths GCSE in his 40s! It's never too late.
Give it your best shot so that you have as many options open to you as you can, but doors always open for people who work hard, no matter what it says on a piece of paper.
Good luck and try not to worry too much - you've got this!
Jenny - a rep from Arts University Plymouth.