Ok i don't do marketing but i dont necessarily think that having an exam that's completely multiple choice will give international students that much of an advantage. the example question you gave "marketing is..." requires you to at least contemplate the meaning of the question and the responses given. sure, if you don't understand the question you can just take a stab in the dark and guess, but you aren't going to do well unless you at least understand the subject matter.
also in terms of practicality, marketing (as a profession) would, i assume, require you to have good decision-makingn skills, and you need to be a good decision-maker to do well in multiple choice (eg. all of these answers seem correct, but which is the BESt answer>>> all of these marketing strategies have advantages, but which is the strategy most in the interests of creating profits for my business?)