Hi pairakesh10,
Many Test Takers use Error Logs to review their CATs (and sometimes their longer homework assignments/quizzes/etc.). They're a remarkably useful way to diagnose (and fix) problems; they're a built-in part of our Course and you should plan to do a full review of each CAT that you take. During that review, you need to note WHY you're getting questions wrong. Was it because the question was too hard? Did you make a silly/little mistake? Were you low on time? Did you "narrow it down to 2 choices and then 'guess' wrong?" Etc. You'll come to find that many of your missing points are from little errors. Fixing THOSE errors is a must if you want to score at a much higher level.
Since you skipped the Essay, this CAT result is NOT completely accurate (the scores are actually likely 'inflated' since you didn't have to face the fatigue/endurance issues that happen during a FULL Test). When you take your next CAT, you really need to take the ENTIRE TEST.
Once you've done the review, you'll have a much better sense about ALL of the problems, the ones that are the most severe and the ones that should be easiest to fix.
GMAT assassins aren't born, they're made,
Rich