Hey Dave,
I'll even take a tangent on what student22 said and encourage you to go into the exam with "false hope." It's amazing the impact that confidence can have on your performance on the GMAT. If you have a confident demeanor, you're much more likely to read effectively, focus appropriately, and spend time wisely than if you're lamenting the end result.
For a pretty compelling story about how much a difference confidence can make, you may want to read this story from a student I worked with:
https://blog.veritasprep.com/2009/03/gma ... -week.html
Strategically, I'd also recommend that you go into the exam with your 3-5 most common errors on either side of the exam fresh in mind. Myself, I noted that mine were:
Assuming that values were positive or that they were integers
Answering the wrong question (solving for x when the question was asking for y)
Forgetting to consider 0 as a potential value
Eliminating answer choices when a statement gave the Data Sufficiency answer "NO", when no was actually "sufficient"
Just by jotting down notes to recognize and correct those mistakes, I caught a few mistakes that I was doomed otherwise to commit, and definitely saved 30-40 points on my score. If you can do the same, you may well be in pretty good shape.
Good luck!
