Possible solutions for you and your honorable teacher
- Clear Browser Cache, if the problem does not solve try another fresh browser.
- Try with another network or use vpn. (When I am writing this reply, I am also facing the same problem, I have connected with your site by using vpn)
http://tomorrowtutor.epizy.com/ not working, but tomorrowtutor.freecluster.eu is working with vpn