Thanks for the criticism...copywriting isn't my strong suit. In my defense I think the site makes sense if you're a teacher. At least that's what my wife (the teacher) tells me :)
But I guess you have some point since I'm guessing that the Edu website gets noticed not because of Web search but word of mouth of teachers. And probably the teachers who spread this website to other teachers have well explained the product's features enough already.
But If you just upgrade the clarity of your site. The web searcher won't get trouble and know your site's purpose immediately.