Hi DCESQ06, welcome aboard. Indeed, whereas you can most likely have a clear cut answer for math, verbal is a bit more tricky. I would say that there is definitely much room for improvement for verbal in your case. You have to ask yourself the following questions:
1- Are you missing the questions because of carelessness?
2- Are you missing the questions because you did not understand the concept?
3- Are you moving on to the next question because the answer is A and you also got A?
4- Are you able to explain the concept in your own words and apply to a different kind of setting?
If your missed questions fall into category 1, then you should not worry too much and just make sure you keep your concentration level at a maximum. Practice under timed condition and do as many CAT tests as possible to simulate those exam conditions.
If your weakness stems from #2,3 and 4, then there is a problem. This means that you have yet to grasp the fundamentals of SC. I like to rank SC learning into two orders:
First order: parallelism, pronoun reference, verb tense agreement, idiom, misplaced modifier
Second order: phrases vs clauses, parenthetical elements, ellipsis, restrictive vs non-restrictive clauses, phrase types(participial, relative, appositive, noun and gerund)
There may be a few things that I omitted here but if you know a bit of the second order SC, you will be able to push your accuracy to 90%+. A good mastery of the first order SC will perhaps push you to the 80% level. If those terms are new to you, I would suggest you to visit this website:
https://webster.commnet.edu/grammar/index2.htm
Also, there are many interesting discussions in the "best of verbal" forum. Make sure you go through that forum before the test day:
https://www.gmatclub.com/phpbb/viewforum ... 565be2c20c
It is definitely a lot to learn but the GMAT is not easy. SC is crucial in order to reach the higher verbal scores because they usually are at the beginning of the test. Miss those early ones and you will have a drastically lower score.