( If nothing else works, you can download moonlight on your personal computer, and connect from there )
2: Make an account on your personal computer here: https://app.airgpu.com/signup.You can also do this on a school chromebook with a pr0xy.
3:On your personal computer, or pr0xy, Click on "Add credit" then "Purchase". You will be redirected to a site where you can fill out your credit card info, and purchase credits
4:On your school chromebook, Click on "Launch cloud gaming" and log into the account with the credits. Start a machine, and connect with moonlight. enjoy playing games!
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NOTES:
If you cannot connect to moonlight at school, or you can't download the app because it's blocked, you may be able to connect to it at home instead. you can use a personal computer for this.