Also - what do your monetization plans look like? I don't think this is something to take lightly. You'll never be able to charge teachers much for the service. Maybe enough for a lifestyle business though, if that's what you're interested in.
Edit: Perhaps college recruiters? Generally they'll pay a lot to convince students to apply. They recoup it in application fees though :) You may also be able to charge parents of graduating seniors some kind of college search tools.
