Thought to share some tips with others taking the exam.
1) Trent Hayes mentions taking the final Practice Exam several times. That's good advice.
2) Study the exam after you've taken it to understand why certain answers are incorrect. There are at least a few questions that have seemingly obvious, but incorrect, answers.
3) Answer some of the questions wrong. Linux Academy will give you additional information when you answer something incorrectly. If you get it right, the feedback might just say "Correct" without reason. There is some useful explanation in the test feedback you can see by answering incorrectly.