Hi Saba,
If we assume that this most recent CAT score is accurate, then you might be at the necessarily 'ability level' right now to hit your goal score. GMAC has publicly stated that the Official Score that you earn on Test Day is within +/- 30 points of actual ability. Assuming a similar 'swing' in how your CATs function, this recent score shows that you could potentially score as high as 700 (at the 'high end', but you might also score 640 - at the "low end").
To try to lock-in a higher score, you should analyze this CAT and try to define WHY you got questions wrong. In that way, you could better define the areas that you should focus on to improve. After reviewing each section of this CAT, how many questions did you get wrong....
1) Because of a silly/little mistake?
2) Because there was some math/verbal that you just could not remember how to do?
3) Because the question was too hard?
4) Because you were low on time and had to guess?
5) How many Verbal questions did you 'narrow down to 2 choices' and get wrong? And how many did you 'narrow down' and get correct?
GMAT assassins aren't born, they're made,
Rich