[Modify/Add] Improved practice exam layout and turned it into an interactive test experience.

practice-exam/practice-exam-6.md

@@ -1,10 +1,8 @@
-# Practice Exam 6
-
-Click on the **Answer** button for the correct answer and its explanation.
-
-If this practice exam has been helpful to you please share it with others and react to this below.
-
 ---
+layout: exam
+---
+
+# Practice Exam 6
 
 1. Which of the following is true regarding the AWS availability zones and edge locations?
     - A. Edge locations are located in separate Availability Zones worldwide to serve global customers.
@@ -518,6 +516,3 @@ If this practice exam has been helpful to you please share it with others and re
       Correct answer: D
     </details>
 
-Please feel free to comment below if any information is inaccurate or if any answers need correction.
-
-[<img align="center" src="../images/list.png" height="30" width="30"/> Exam List](../practice-exam/exams.md)