Well, the GMAT Prep test primarily reflects a candidates preparedness for the test. Towards the early stages of preparation, GMAT prep indicates the exact level of a test takers ability.
Therefore, instead of resorting to searching for solutions to question asked in the GMAT Prep, you must use it to zero in on your weakness.
If the majority of your mistakes in verbal were from sentence correction, then sentence correction is your weakest area. If the majority of the mistakes were from critical reasoning, then critical reasoning is your weakest area. I hope you're getting the point.
Don't worry about the GMAT Prep score right now
It only reflects your present ability and is in no way an indicator of what you're likely to score in the actual GMAT (unless you plan to take it within the next two days
Also, the GMAT prep is just a tool to get to know the whole interface and stuff.
Don't be too stressed about this. Just use the test to spot your weaknesses and then work towards plugging them gaps
"Wherever you go, go with all your heart" - Confucius
1. How to Review and Analyze your Mistakes (Post by BB at GMAT Club)
2. 4 Steps to Get the Most out out of your CATs (Manhattan GMAT Blog)
My Experience With GMAT
1. From 650 to 710 to 750 - My Tryst With GMAT
2. Quest to do my Best - My GMAT Journey Log