GMAT Verbal Section | Tips to improve verbal score

Hello!! I scored 20 in verbal which is pathetic. The main problem I faced was time management and slow handling of SC questions which I believe is supposed to be the easiest. I really need some expert guidance. Even though I know the SC rules, I feel completely lost when I see the problem. If I can achieve 100% accuracy in SC questions, I can handle other sections in much better way thereby drastically improving my scores. Please help me.

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