The more you study for an exam, the less sure you are which answer they want.

Related:

• Basic Law of Exams: The more studying you did for the exam,
  the less sure you are as to which answer they want...
• Second Law of Applied Terror: The more studying you did for the exam,
  the less sure you are as to which answer they want...
• Why study? The more you study the more you know, the more you know the more you can forget,
  the more you can forget, the more you do forget, the...
• The Party Law: The more food you prepare,
  the less your guests eat...
• You know you've been hacking too long when... ...you wish you could study for an exam by executing the command:
  cat civ100 | tee...
• One of the major functions of skin is to keep people who look at you from throwing up.
  Actual exam...
• If you are given a take-home exam, you will forget where you live.
  Corollary to the Fifth Law of Applied...
• It's unfortunate that the process of learning is measured by one's performance on stressful exams.
  Armed with the same amount of knowledge, at a different...
• Fifth Law of Applied Terror: If you are given an open-book exam,
  you will forget your book. Corollary: If you are...