The answer validation in Google Forms could be done with Google Apps Script after the students submit their responses, i.e. by using onFormSubmit event.

Once the answer was submitted, you could use the Class File to get properties like:

• Viewers
• Editors
• Owner

It's worth to say that in the 2014 summer Google launched Google Classroom to help teachers to manage the assignments of their classes among other tasks.

References

Validate answers in your form - Docs editors Help

There's no way to obtain heading URLs, this is a popular but unsatisfied request. However, you can speed up your function by only looking into headings:

function goto ( title ) {
  var doc = DocumentApp.getActiveDocument (),
      body = doc.getBody (),
      searchType = DocumentApp.ElementType.PARAGRAPH,
      searchResult = null;

  while ( searchResult = body.findElement ( searchType, searchResult ) ) {
    var par = searchResult.getElement ().asParagraph (),
        heading = par.getHeading ();
    switch ( heading ) {
      case DocumentApp.ParagraphHeading.HEADING1:
      case DocumentApp.ParagraphHeading.HEADING2:
      case DocumentApp.ParagraphHeading.HEADING3:
      case DocumentApp.ParagraphHeading.HEADING4:
      case DocumentApp.ParagraphHeading.HEADING5:
      case DocumentApp.ParagraphHeading.HEADING6:
        if ( par.findText ( title ) ) { 
          // assumes that title is unique among headings
          // and it does not appear as a subset of a heading
          doc.setCursor ( doc.newPosition ( par, 1 ) );
        }
        break;
    }
  }
}

If you want to help, you can star the corresponding Google Apps script issue.

EDIT: Fixed a]two syntax errors