re-try!

great.py

import requests
from bs4 import BeautifulSoup

leads = []
rates = []

for i in range(3):
	url = "https://www.greatschools.org/virginia/manassas/prince-william-county-public-schools/schools/?page={}".format(i)
	r = requests.get(url, headers={'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.95 Safari/537.36'})
	soup = BeautifulSoup(r.text, 'lxml')
        print url
        for sub_heading in soup.find_all("a", {"class":"open-sans_sb mbs font-size-medium rs-schoolName"}):
            lead = sub_heading.text
            leads.append(lead)
        for sub_headings in soup.find_all("span", {"class":"gs-rating"}):
            rate = sub_headings.text
            rates.append(rate)
print leads, rates