'Adds a prerequisite to a subsection.'

def add_prerequisite_to_subsection(self, min_score):

    Select(self.q(css='#prereq')[0]).select_by_index(1)
    self.q(css='#prereq_min_score').fill(min_score)
    self.q(css='.action-save').first.click()
    self.wait_for_ajax()
