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MartyTargetTestPrepI was consistent from last 2 months studying atleast 6hr a day. I did self study, used Manhattan Guides and solved only OG questions with timing.
In official mocks my Verbal have never moved above 28+ even after practicing alot and with all basics cleared.
OK, so, a key thing you need to do is practice verbal UNTIMED until you are getting most questions correct.
When you practice verbal timed, you don't have time to learn. So, your accuracy and score don't change.
Thus, what you have to do instead is practice each GMAT verbal topic untimed until you are achieving high accuracy in that topic, such as the following:
Easy - close to 100%
Medium - 90%+
Hard - 70%+
Once you're achieving those accuracies consistently, you can work on speeding up in verbal until you're answering questions at test pace, but work on accuracy before speed.
For some more tips on increasing your verbal score, see this video.