This is something that is out of my knowing, so please forgive its scrappy and unclearness of my reply.
Ok first do you have all your work copy righted? If not you need to make sure that this is done, otherwise there could be a possibility someone could nick your code and work.
Check out sites like www.download.com
do a search for educational games and jot down the companies that publish the programmes.
Then visit their web sites, and send them an e-mail with a basic overview of what you have created, and ask them if they would be interested. Also ask How there got started out, and how there got there first brake.
Check out companies like Nightingale-Conant http://www.nightingale.com/
who might be able to give you better quality advice on how to get started.
I am assuming publishing a game would be very much like publishing where you would have to send a copy of your script/game to publishers. So that might mean you might have to create a test mode based game that you are happy to let people play with. Something that just popped into my mind is you might be able to get your game published via download.com in a test mode for mat.
Then e-mail educational authorities and asked to give it a test for you. And you might get lucky and some funding via an educational body. Also check out places like dyslexic and special needs educational centers.
Well I don’t know if any of this is helpful
Yet I wish you ever bit of luck and success