'Returns table of content for the entrance exam specific to this test
Returns the table of contents for course self.course, for chapter
self.entrance_exam, and for section self.exam1'

def _return_table_of_contents(self):

    self.field_data_cache = FieldDataCache.cache_for_descriptor_descendents(self.course.id, self.request.user, self.entrance_exam)
    toc = toc_for_course(self.request.user, self.request, self.course, self.entrance_exam.url_name, self.exam_1.url_name, self.field_data_cache)
    return toc['chapters']
