MCQ Tip
Remember to always read ALL possible answers when you are tackling a multiple choice question.
Key point: Sometimes there will be MORE THAN ONE answer which is to all intents and purposes CORRECT.
The GRE examiner expects you to pick the BEST, most appropriate answer from the choices he gives you. So even when you fully understand the question and are feeling confident, still read all the possible answers instead of picking the first right one in a rush. There might be a better one further down!