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By far the most important rule to know is LOCKED CONTENT, as it is central to a great many questions. The difficult part of these questions is not knowing the rule itself, but rather knowing LOCKED CONTENT. One thing that many students miss is being able to identify situations where LOCKED CONTENT applies instead of LOCKED CONTENT.

A practical tip: when you watch a video, always start by carefully looking for LOCKED CONTENT on the road you are about to join. One of the questions with the highest proportion of incorrect answers in the entire database contains precisely LOCKED CONTENT that a great many students miss.