In almost all endeavors, it really pays to be prepared or having at least an idea of what you’re going through. If you’re going into a job interview, you should at least know the background of the company you’re applying to.
If you’re going to start a business, you should know the market and have a detailed feasibility study. If you’re going to take a very important exam over the weekend like a gre, you should at least open your notes for a short time gre prep to have a glimpse on the possible questions that might come out. Prepared people would most likely get pass through a challenge.