Tactics
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1. Read each item word for word. Don't just look at the underlined portion of the sentences because the error is often incorrect only because of the context of the sentence.
2. Don't read too quickly. If you do, your eyes may skip over errors, especially those involving "small words" (prepositions, pronouns, articles). Try to pronounce each word in your mind as you read. This will help you catch errors that "sound wrong."
3. If you are unable to find an error after the first reading, look at the verbs in the sentence to see if they are used correctly, since verb errors are the most common errors in Part VI. Check the verb's tense, form, and agreement with the subject.
4. If the verb seems to be used correctly, check for other common errors: word choice, word form, preposition use, and so on.