hi,
I had my TOEFL exam about a month ago. I actually received a higher score on the actual test than on the ones I had at home. perhaps this has to do with the fact I can`t evaluate myself unbiasedly.anyway try not to panic, not to waste too much time on one thing and to make as many notes as possible on the listening part. also, on the speaking, you can have a good matk even with just one point, but a one which is developed well.
hope this helps in some way