<p>I just started studying the Manhattan Logical Reasoning prep book and I am somewhat confused with how to evaluate the logic of "necessary" assumptions and "sufficient" assumptions. I cannot instinctively grasp the cores of arguments along with their assumptions. I can if I write them out, but that would be impossible during the real exam. Then come the questions asking you to determine the "necessary" and "sufficient" assumptions. I am a visual learner. I need to see diagrams and my thoughts need to be written down to analyze things. How do all of you LSAT experts determine these assumptions in your mind without writing them down? Did you have these same issues when you first began studying for the LSAT? Will determining assumptions come easier to me the more I study?</p>