Hello Angie,
I recommend that you watch the video dedicated to the final exam and the 35 contact hours "Module 00.4 - Final Exam & 35 Contact Hours", also you can read the related section in the student workbook (page 23, Page

.
1- you need to answer 17 questions correctly to pass the exam.
2- the exam has a total of 25 questions.
3- I don't remember if there is a time limit for the exam or not (most probably NOT), but you should be able to complete it within 20-30 minutes. the questions are relatively easy and straight forward.
4- you can't pause the test.
Also, you can take the final exam as often as you need until you pass.
Good Luck.