Hi,
I have seen your post. I already developed online examination system. Where,
admin can set question and answer from admin panel. After that student can view the question spontaneously from front end, If they want any question can not answer then they can skip the question. They can highlight the question for review. After submit the paper they can view how many no of questions are attending or leave.
If you want Descriptive question answer function I can make it too: There will be available word limit, student should write answer within word limit, copy pest would be not allowed.
I have checked your attachment . I can do this work.
Thanks