I suppose what you could do is create 24 gmail accounts with similar names and have them all forward to one address so its easier to keep track of.
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Okay, I think I've figured out a workaround to this problem, but would like to run it through here just in case there's a chance it won't work or the possiblity of me getting banned.
I just tried registering a couple of accounts (free) using the same email that already owns a copy of Minecraft. All the accounts registered fine.
So it seems more than one account CAN be registered to email. So I'm thinking: I can create the accounts that I need, i.e. School1, school2... etc, using the generic school email then log into each account on MC.net and redeem a gift code using each account.
In theory I see that working. Anyone care to provide reasons why it might otherwise not work?