I had a similar problem during the last week before the sept lsat. I think I was cramming too hard and instead i should have focused more on remaining calm and being careful while testing. While you're anxious it's easy to miss an inference during a game, or read one of those tricky ordering rules backwards.
Good luck, try your best, and even if you mess up you can just cancel/retake in February. That's my advice!
It's the last week, I'd relax a bit. Maybe do some logic games for fun, untimed. You're probably not going to really get any better in one week if you've already spent a long time practicing, but on the other hand, you can stress yourself out to the point where you'll do worse.