Yeah, I've had quite a few people wish me luck too.... It shouldn't make you feel bad though, remember they're doing it because they have confidence in you - use their well-wishing to make you have confidence in you!
Oh, and I've noticed a few people saying they're spending the day desperately memorising essays/stories - i don't want to freak you out, but my advice would be to go in with ideas and quotes memorised, rather than whole essays - it means you can easily adapt your knowledge to the specific question, and you won't freak out if what you've memorised doesn't fit. Plus you don't have to spend all day memorising something that long.
Good luck everyone, remember to just do some light revision, get a good night's sleep, and most of all, STAY CALM!