text: Listening to different peoples opinions and experiences will inform you about more possible outcomes. Everyone that offers you advice could tell you something totally different, and that just tells you about how many possible outcomes you should be prepared for. Before a big test I ask my friends that have already taken it about how it went, and if they think I should prepare more by studying a certain topic. If my friends scores surprise me then I can infer that the test was either very hard or very easy. Asking more than one friend will also help me make a better choice on whether I should study a certain topic or not.