title: PHP quiz with back and forward option
body: <p>I want a PHP Quiz script which will having following features</p>
  
  <ol>
  <li>User can select answer from multiple choices (radio button or checkboxes ) along with a small textarea for brief explanation where needed.</li>
  <li>User can go back and forth to change any answer</li>
  <li>Time will be on whole quiz not per question level</li>
  <li>General Admin work of a quiz</li>
  </ol>
  
  <p>I have searched but did not found a good solution for my need. Have anyone come across a matching PHP opensource script? </p>