The 80/20 rule says that 80% of your output comes from 20% of the effort. I am a firm believer of this amazing rule and hence would like to start off by discussing something that can make the biggest difference to your GMAT score.

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The 80/20 rule says that 80% of your output comes from 20% of the effort. I am a firm believer of this amazing rule and hence would like to start off by discussing something that can make the biggest difference to your GMAT score.