Which of the Following Is a Valid Study Tip to Prepare

Which of the following is a valid study tip to prepare to take a national certification exam?

A) Have a cram session with friends the night before the test
B) Eat a sugary breakfast to provide carbohydrates for stamina during the test
C) Get a good night's sleep before the test
D) Avoid taking practice exams
E) Study what you do know, and don't worry about what you don't know