Try thinking of 5 reasons on how being able to access yahoo mail would help you in your learning and as long as there all valid write them up in a letter, sign it and hand it to your admin.
If you can't think of anyway having yahoo mail is gonna help you in your learning you can just wait until you get home ;)
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do you have a school email address, set up yahoo to forward all your mail to your school email address.
You could read this one and try some of them. But you may have to accept that school knows these things and has made sure that you can't.L