For universities and graduate schools, go to www.usnews.com, the

select the categoy.

For elementary, middle school and high school, I went to www.movoto.com, then select "schools" at the top, select the city (or cities) you want to check, then select elementary/middle/high school, then you can see the current API for each school. Then you can export them to excel and sort the API's.There might be other info froom the websites of the school districts, but I think this way is more convenient.

Hope it helps.