Only one of these is the correct response and the other three are known as distractors. The multiple completion questions follow a similar design but one or more of the answers may be correct. One has to first decide which of the two statements is correct when considered as a separate statement. If we consider that both are correct then we must decide whether the second statement provides an explanation of the first. A matching-pairs question calls on you to select items from one list and match these to items from a second list.
Most Boards now use mainly single stem questions.
For revision it's best to note that subject areas appearing at the beginning of the syllabus document are normally tested first. The questions which appear towards the end of the paper will normally be more 'general' in their construction and will call for you to think and apply your knowledge from across the syllabus. They are quite often 'macro' in content, though some 'applied micro' topics might be used. Think about the following when preparing for a multiple choice exercise or examination. Don't spend overlong on a question that has genuinely got you beaten try to pass through the paper quite quickly, doing those questions which you find straightforward then go back and try those questions that you could not immediately see the answer to in your first run then try those that in the category of 'got me foxed' and never leave one question unanswered.