1. Learn the Greek alphabet.
    Learn it so well you're able to recognize those letters in someone's handwriting.
  2. What frequency the electric power supply in different corners of the world is.
    They'll literally laugh at you for not knowing. Most of it will be nervous laughter because they're faking knowledge like you are.
  3. Learn how to fake knowledge.
    You'll always need to know how to do that. In high school you may have not cared, start caring now.