Laravel online exam application user interface

I have setup a back end environment for online exam application(it is like class marker

) Now i am really confused about how to handle the graphical user interface. how should i display questions. when to use ajax. also heard about step forms? how to display answers after he has taken exam. How to prevent the user to go back to that test page by clicking back button? Doing all this with security to be the top priority. Please help

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