For schools to get "down and dirty" with their rankings, you typically have to be an enrolled student there.
Schools simply don't like to give out board scores/rankings to pre-dental students.
For MOST schools the best response you'll get is "we were 9th in the nation for the past three years" or "our average part I scores have risen 8 points in the last two years," etc., etc.
SOME schools will flat-out tell you, but most schools won't, so don't be surprised if you run into dead-ends in your quest for official information.