GMAT Sentence Correction (SC) | Sentence Correction Guide

Hello All

guys, I need your help. I totally new to this forum and also to GMAT. so as a baseline I took a mock test from Vertias Prep and got 540(Q43 and V22) which is quiet low the so started off with verbal section, especially SC, as it required a lot of improvement. but the problem is that I cant see any significant improvement in my score for SC. I have done Kaplan Verbal book SC section and also have completed
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