parental control

I have a Windows 7 desktop and use Google Chrome browser. I want my 7 yr old child to access only 2 school related websites. How can I do it? I would really appreciate a stepwise direction. Thank you.
P.S. For now I use https://familyfriendlydns.com/ but seems they are blocking only porn and other inappropriate sites, but I cannot find how to block any other sites on that.