The simplest way to 'game' multiple choice based forms of IQ test is to guess the multiple choice options when you don't actually know the answer. This isn't likely to allow you to fake genius, but will boost your score relative to a majority who don't attempt all questions unless there's a very well-designed negative marking scheme.

Willingness to guess answers to ensure the whole test is completed probably is associated with many of the success outcomes associated with higher IQ scores, but it isn't exactly what most people would consider to be intelligence.