Spam or commercial emails are sent to random customers.
They often contain misleading subject lines and badly crafted messages.
An essay which concludes on a note of ambiguity which claims that the argument has one or more valid points but lacks adequate information which would have made a claim more believable.
Vocabulary and sentence formations could also be enhanced through preparative materials such as Barron's wordlist, flashcards, and continuous revision.
Hard work never fails, and with all these guidelines you cannot fail to score high on this part of the GRE.