'Checks whether this sequential is a special exam.  If so, returns
a banner_text or the fragment to display depending on whether
staff is masquerading.'

def _special_exam_student_view(self):

    if self.is_time_limited:
        special_exam_html = self._time_limited_student_view()
        if special_exam_html:
            banner_text = _('This    exam    is    hidden    from    the    learner.')
            return (banner_text, special_exam_html)
