There are two aspects of verbal. Getting a question correct & getting in correct within less than 2 mins. I suggest you to identify your weakness in one of these two & practice a lot concentrating more on verbal. You can also go one step further & find the weaker area/areas among SC, CR & RC & attack it with some strategies. You will find many stratiegies on our forum & also in some std books.
Further, there is no substitute to practice. All the best to you