Hi nooraftab,
Yes - questions that are left unanswered are 'penalized' (and the penalty is worse than if you had simply gotten the questions wrong). Unfortunately, it's difficult to say exactly how many points you actually lost because of the penalties here - since there are additional factors that also would have influenced your score. That having been said, pacing issues do NOT exist on their own - they're the results of OTHER issues. To solve this problem, and score at a much higher level, you'll likely have to make significant changes to how you 'see' (and respond to) the GMAT.
Before I can offer you the specific advice that you’re looking for, it would help if you could provide a bit more information on how you've been studying and your goals:
Studies:
1) What study materials have you used so far?
2) How have you scored on each of your CATs (including the Quant and Verbal Scaled Scores for each)?
Goals:
3) What is your goal score?
4) When are you planning to take the GMAT?
5) When are you planning to apply to Business School?
6) What Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich