GMAT Sentence Correction questions ask you which of the five choices best expresses an idea or relationship. The questions will require you to be familiar with the stylistic conventions and grammatical rules of standard written English. You must also demonstrate your ability to improve incorrect or ineffective expressions. This section tests two broad aspects of language proficiency:

• Correct expression: A correct sentence is grammatically and structurally sound. It conforms to all the rules of standard written English, e.g., noun-verb agreement, pronoun consistency, pronoun case, and verb tense sequence. A correct sentence will not have dangling, misplaced, or improperly formed modifiers, unidiomatic or inconsistent expressions, or faults in parallel construction.
• Effective expression: An effective sentence expresses an idea or relationship clearly and concisely, as well as grammatically. This does not mean that the choice with the fewest and simplest words is necessarily the best answer. It means that there are no superfluous words or needlessly complicated expressions in the best choice. In addition, an effective sentence uses proper diction—the standard dictionary meanings of words and the appropriateness of words in context. In evaluating the diction of a sentence, you must be able to recognize whether the words are well chosen, accurate, and suitable for the context.

This practice test contains 12 questions. Click here to start.