I know that many people care about whether we should pay more attention to high rate of correct or to pace. Most of people think high correct rate is more important. However, GMAC mentions that (excerpt from OG 11th page 17 not deduce) :
Myth: it is more important to respond correctly to the test questions than it is to finish the test.
Fact: there is a severe penalty for not completing the GMAT test.
If you are stumped by a question, give it your best guess and move on. If you guess incorrectly, the computer program will likely give you an easier question, which you are likely to answer correctly, and the computer will rapidly return to giving you questions matched to your ability. If you don't finish the test, your score will be reduced greatly. Failing to answer five verbal questions, for example, could reduce a person'sscore from 91th percentile to the 77th percentile. Pacing is important.
Hope it is useful.