I have looked into Imagine k-12, and sadly they are closed to new applicants right now which I'm super bummed about, and NewSchools. How else can I get seed funding for an educational startup that is not necessarily a high tech educational product?
Also, what sort of models succeed in this atmosphere?
Without knowing the specifics of your product, or how much money you are seeking, here are some possibilities:
I agree with the above answer that you should look at a range of options, however there are a few other Education focused accelerators I am aware of if you are set on that.
http://www.emergeventurelab.com/edu/ http://learnlaunchx.com/ https://angel.co/socraticlabs http://www.techstars.com/introducing-kaplan-edtech-accelerator-powered-by-techstars/ http://labs.pearson.com/catalyst/ http://www.edtechincubator.com/ Many other incubators are open to edtech startups, especially if they are connected to universities. My startup http://edspire.com is incubated by Isis (connected to Oxford University) at http://incubator.isis-innovation.com/