Don't worry about the percentage of questions you answered correctly on the GMATPrep tests. The number of questions you answer correctly/incorrectly has little to do with your score. What matters is the difficulty level of the questions you answer correctly/incorrectly.

Here's a little story to illustrate this point:
When I was writing the article Taking the GMATPrep Practice Tests Multiple Times (https://www.beatthegmat.com/mba/2010/03/ ... iple-times), I took GMATPrep Practice Test #1 four times, and each time I answered every second question correctly (I did this for the quant section only)

Given that I correctly answered exactly half of the questions each time, you'd expect my quant scores to be roughly the same for all 4 tests.

My 4 scaled scores were: 19, 23, 26 and 42

This represents a percentile range from approximately 8th percentile to the 63rd percentile (I'm fairly confident that you'd get the same results on the verbal side)

So, it's not about how many questions you answer correctly/incorrectly; it's about the level of difficulty of the questions you answer correctly/incorrectly.

So, my advice is to just focus on your final scores.

I hope that helps.

Cheers,
Brent