Yes.
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No, people do not give out admin for free on servers to any random stranger
I highly doubt there are any public servers that give ranks out free, I give ranks out freely to people who play on my server... but it's private.
yes
No, there is not any good servers for Minecraft 1.6.6. In fact, there are no more 1.6.6 servers at all. There are only updated servers. My recamendation is for you to update minecraft. All of the servers, or the most active, always update.
Yes. There are minecraft servers that have skyblock with nether enabled that are cracked.