Hi asocialnot,
The scoring algorithm for the Official GMAT is far more complicated that you realize. In general, while getting more correct answers should help you to raise your score, there are a variety of factors that influence the Scaled Scores that you'll receive (and you can actually get MORE correct answers from one CAT to the next and end up with a lower score). These factors include, but are not limited to, the relative difficulty of the question, when it appears, what's "going on" around it, if the question even counts (some questions are experimental and are worth 0 points), if you run out of time at the end and leave questions unanswered, etc.
This all means that you can't just look at the number of correct answers as a goal. The BETTER goal is to minimize your silly/little mistakes. Have you taken any FULL-length practice CATs yet? If not then you should take one soon to establish a "baseline score"; if you have, then you should review the entire CAT and make a list of the questions that you got wrong and WHY you got them wrong. Fixing the little mistakes (and keeping them from happening) is essential if you want to score 650+ on Test Day.
GMAT assassins aren't born, they're made,
Rich