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That happened when i tried to do it on my computer at school when the school has blocked it you can not get on but you can ask you librarian or a teacher why they blocked it and why they did.
You can bring a flash drive in, and put .minecraft and minecraft.jar in the school computer and thus run the .jar and play minecraft offline, on any worlds.
Minecraft.net download from there
You shouldn't be playing games in school, because it is a place where your parents send you to learn. But this is your decision not mine. First download Minecraft from minecraft.net. When done, open the launcher and log in. If you wanted to play multiplayer, it is banned it most schools, so you will have to get passed the firewall, which is unsafe because you might get kicked out of school, so just play single player.
100% minecraft