The essay section isn't new, but you'll have two samples instead of one. The essay usually is about a topic or opinion statement that you have to talk about. The best way to organize it is to use the standard five-paragraph essay format. That way you don't have to worry about organization and can focus on the writing itself. Plan out your outline beforehand, and then write. They just want to see your ability to explicate a certain point of view in a limited time.