Ophelia

Which do you think will be the best way to do this?

I would rather choose not give the back option there first. Secondly my database will contain bunch of options for  levels in different professions. e.g database could be a major field, same like dotnet, oop, se, datastructure and so on. And for each level there would be so many different questions. 

You can then force to select the career level then randomly give the question with the options and also time restrictions.