So, with that in mind:
1) The first and, perhaps best known, is Skrafty: http://whenyouriseup.com/
They have a special going right now: I wanted to remind you all about the SKrafty Black
Friday weekend sale which ends on Sunday night at midnight! Have you been wanting
to add some SKrafty classes to your homeschool? Now is the time since we have a nice
discount for you today. ALL classes are 20% off with the code BLACKFRIDAY.
2) http://minecrafthomeschool.com/
From their page:
Benefits of Minecraft Homeschool
- Learning is FUN! Students are assigned weekly lessons that include online videos, informational websites, and Minecraft assignments to apply their learning.
- Teamwork is required! Students must learn to work together and respect each others space to maximize results.
- Technology is here to stay! Typing, TeamSpeak servers, Minecraft servers and understanding the basic workings of the server/client relationship are side effects of living in a Minecraft world.
- Fits Your Schedule – You can study, perform tasks, and work with classmates on your own schedule. Each week we expect you to do the out of game work first, and then login to the server to perform the week’s in-game tasks.
Both of these servers have been up and running for quite awhile. They have been providing services and have been, to the best of my knowledge, been quite satisfactory in their provision of those services... so if you don't feel quite up to being in charge of Minecraft education just yet, these servers may offer you an attractive alternative.