These questions consist of a sentence with an underlined section, followed by 5 answer choices. The task is simple - to choose the best version from the given choices.
The aim of the sentence correction questions is to test one’s knowledge of standard written English. However, this section is not only about reading the choices and identifying the one that sounds best. Sentences are often confusing and most questions test more than one grammatical issue.
In order to ace the sentence correction questions, you need to come up with a very systematic approach. Aside from reading the sentences very carefully and trying to spot the error, there some other niceties that you need to master, such as idioms.
This Magoosh GMAT video presents some must-know idioms, which are very likely to show up on your GMAT exam.